Journal articles: 'Speed strength'

1

Judge, Lawrence W. "Developing Speed Strength." Strength and Conditioning Journal 29, no. 5 (October 2007): 42–54. http://dx.doi.org/10.1519/00126548-200710000-00007.

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Trikha, Sorabh. "Comparative Status of Strength and Speed Between Different Team Games." Global Journal For Research Analysis 3, no. 7 (June 15, 2012): 253. http://dx.doi.org/10.15373/22778160/july2014/90.

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Goatley, J. M., D. B. Smith, P. D. Gerard, and G. E. Coats. "Comparing Sod Strength Parameters of Warm-season Turfgrasses Using a Hydraulically Driven Sod Strength Machine." HortTechnology 7, no. 4 (October 1997): 421–26. http://dx.doi.org/10.21273/horttech.7.4.421.

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Research was conducted to evaluate the performance of a hydraulically driven turfgrass sod strength machine equipped with a force transducer to measure various strength parameters. The most commonly reported strength parameter, peak force (PF), continued to provide the quickest and easiest measurements of sod strength. Calculations of work involving the continuous measurement of sod strength over the duration of the stretch did not consistently improve the information provided by the PF measurement. Changes in sod bed pull speeds altered the calculations of work, whereas pull speed changes generally had little effect on force measurements, an important consideration for sod strength measurement devices that have limited control of sod bed pull speed. The unit was marginally successful in distinguishing sod strength differences between St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze.] treated with various levels of pyridine herbicides. The device also provided strength parameters that distinguished the relative strengths of four warm-season turfgrass sods.

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4

Morrow, Lee J. "SPEED DEVELOPMENT: Single leg strength: Its relationship to speed enhancement." National Strength & Conditioning Association Journal 8, no. 5 (1986): 64. http://dx.doi.org/10.1519/0744-0049(1986)008<0064:slsirt>2.3.co;2.

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Ryazanov, Anton, and Mikhail Bogdanov. "Volleyball players speed-strength abilities development." Tambov University Review. Series: Humanities, no. 178 (2019): 53–59. http://dx.doi.org/10.20310/1810-0201-2019-24-178-53-59.

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Volleyball-one of the team games, where muscle work is mostly presented by speed-power and coordination. Speed-strength training of volleyball players is solved by means of specialization and individualization of preparation methods, optimization of correlation physical and technical training, taking into account age features, a condition and preparedness of volleyball players that causes need of carrying out additional researches. The purpose of the study: to develop and test in practice the effectiveness of development methods of speed-strength abilities of volleyball players volleyball club “Tambov” in the preparation period. The following tasks are to be solved: 1) to determine the tests to assess of volleyball players speed-strength abilities; 2) to work out a methodology for the development of speed-strength abilities of volleyball players in the preparation period; 3) to test experimentally the effectiveness of the developed technique. Re-search methods: analysis and generalization of scientific and methodical literature; pedagogical observations; testing of speed-power abilities (control tests); pedagogical experiment; mathemati-cal and statistical methods of information processing. Analysis of the experiment results allowed to establish an increase in the speed-strength abilities, reflecting the height of the jump – by 12 %; in indicators, reflecting the speed of movement – by 2 %; in indicators, reflecting the explosive force – by 8 %.

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Pierce, John W. "Motivating With a Speed-Strength Meet." STRENGTH AND CONDITIONING JOURNAL 18, no. 1 (1996): 70. http://dx.doi.org/10.1519/1073-6840(1996)018<0070:mwassm>2.3.co;2.

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7

McCarthy, David, and Robyn L. Jones. "SPEED, AGGRESSION, STRENGTH, AND TACTICAL NAÏVETÉ." Journal of Sport and Social Issues 21, no. 4 (November 1997): 348–62. http://dx.doi.org/10.1177/019372397021004003.

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8

Pauletto, Bruno. "STRENGTH TRAINING MODALITIES: The Speed Chute." National Strength & Conditioning Association Journal 13, no. 4 (1991): 47. http://dx.doi.org/10.1519/0744-0049(1991)013<0047:tsc>2.3.co;2.

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9

Cross, Tom. "SPEED/STRENGTH EXERCISE: The Lateral Squat." National Strength & Conditioning Association Journal 13, no. 4 (1991): 56. http://dx.doi.org/10.1519/0744-0049(1991)013<0056:sse>2.3.co;2.

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10

Tabachnik, Ben. "STRENGTH TRAINING MODALITIES: The Speed Chute." National Strength & Conditioning Association Journal 14, no. 4 (1992): 75. http://dx.doi.org/10.1519/0744-0049(1992)014<0075:tsc>2.3.co;2.

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11

Paek, U. "High-speed high-strength fiber drawing." Journal of Lightwave Technology 4, no. 8 (1986): 1048–60. http://dx.doi.org/10.1109/jlt.1986.1074848.

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12

Dobrowolska, Ewa, and Barbara Lichaczewska. "The impact of crosshead speed on the strength of spruce wood (Picea abies L.)." Annals of WULS, Forestry and Wood Technology 109 (March 31, 2020): 126–36. http://dx.doi.org/10.5604/01.3001.0014.3430.

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The effect of crosshead speed on the strength of spruce wood (Picea abies L.). This work examines the compression and tensile strength along the grain and bending perpendicularly to the grain of spruce wood was investigated at various crosshead speeds. The dependence of the immediate strength on the crosshead speed takes the form of an exponential function for compression and tension along the grain and bending perpendicular to the grain. The study showed that as the crosshead speed increases, the ultimate strength value increases regardless of the type of stress occurring. The bending strength is between the compression and tensile strength values. The strength for compression along the grain for the spruce wood tested is 50% of strength tension along grain length and 57% of the bending strength. The bending strength corresponds to 88% of the tensile strength.

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13

Protas, Elizabeth J., and Sandrine Tissier. "Strength and Speed Training for Elders with Mobility Disability." Journal of Aging and Physical Activity 17, no. 3 (July 2009): 257–71. http://dx.doi.org/10.1123/japa.17.3.257.

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The purpose of this study was to pilot test a function-focused exercise intervention consisting of strength and gait-speed training in elders with reduced walking speed, decreased walking endurance, and functional impairment. Twelve participants, 77.2 years old (± 7.34), whose usual gait speed was <0.85 m/s, with walking endurance of <305 m in 5 min, and who were functionally impaired participated in a moderate-intensity exercise intervention. The training occurred 3 times per week, 75 min per session, for 3 months and combined 4 weeks of gait-speed training, walking exercise, and functional strengthening. The participants demonstrated mean usual gait speeds (≥1.0 m/s), endurance (≥350 m), and functional ability (≥10 score on performance battery) that were within normal limits after 12 weeks of training. Fastest gait speed (≥1.5 m/s) and muscle strength also improved significantly. Improvements were maintained during follow-up testing after 3–6 months. In summary, a 12-week intervention for frail, mobility-disabled participants led to improvements in walking, function, and strength.

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14

Praveen, V. V., T. D. John, and K. M. Peethambaran. "Experimental Investigation of Welding Parameters on Automatic TIG Welding of Aluminium 5083 Plate." Materials Science Forum 879 (November 2016): 1459–64. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1459.

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To improve the weld quality of AA 5083 plate using AA 5356 filler rod, an automatic TIG welding system is developed, by which welding speed can be controlled and a uniform speed is obtained. Welding of aluminium 5083 plate is carried out for different welding currents and welding speeds. In this work, the effect of welding speed and current on, the tensile strength of the weld, hardness at the three different zones viz. weld metal, HAZ and base metal are investigated. The temperature is measured at the HAZ and base metal. The hardness and temperature on the weld zone and the base metal are greatly influenced by the welding speed and current. It is found that the weld strength is influenced by different values of weld current and speed, but sometimes with high current, welding speed has no specific effect on the tensile strength of the weld. The effect of material deposition rate on the weld strength in uniform welding is studied. The weld thickness to width ratio is an important aspect in the analysis of weld strength. The values obtained for current and speed are taken for optimizing the strength and hardness, using Taguchi method and utility concept.

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15

Hartmann, Hagen, Klaus Wirth, Michael Keiner, Christoph Mickel, Andre Sander, and Elena Szilvas. "Short-term Periodization Models: Effects on Strength and Speed-strength Performance." Sports Medicine 45, no. 10 (July 2, 2015): 1373–86. http://dx.doi.org/10.1007/s40279-015-0355-2.

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16

Muehlbauer, Thomas, Urs Granacher, Ron Borde, and Tibor Hortobágyi. "Non-Discriminant Relationships between Leg Muscle Strength, Mass and Gait Performance in Healthy Young and Old Adults." Gerontology 64, no. 1 (September 16, 2017): 11–18. http://dx.doi.org/10.1159/000480150.

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Background: Gait speed declines with increasing age, but it is unclear if gait speed preferentially correlates with leg muscle strength or mass. Objective: We determined the relationship between gait speed and (1) leg muscle strength measured at 3 lower extremity joints and (2) leg lean tissue mass (LTM) in healthy young (age: 25 years, n = 20) and old (age: 70 years, n = 20) adults. Methods: Subjects were tested for maximal isokinetic hip, knee, and ankle extension torque, leg LTM by bioimpedance, and gait performance (i.e., gait speed, stride length) at preferred and maximal gait speeds. Results: We found no evidence for a preferential relationship between gait performance and leg muscle strength compared with gait performance and leg LTM in healthy young and old adults. In old adults, hip extensor strength only predicted habitual gait speed (R2 = 0.29, p = 0.015), whereas ankle plantarflexion strength only predicted maximal gait speed and stride length (both R2 = 0.40, p = 0.003). Conclusions: Gait speed did not preferentially correlate with leg muscle strength or leg LTM, favoring neither outcome for predicting mobility. Thus, we recommend that both leg muscle strength and leg LTM should be tested and trained complementarily. Further, hip and ankle extension torque predicted gait performance, and thus we recommend to test and train healthy old adults by functional integrated multiarticular rather than monoarticular lower extremity strength exercises.

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17

Gubzhokov, A. Kh. "DEVELOPMENT OF FIRST RECRUITED CITIZENS’ SPEED-STRENGTH." Historical and social-educational ideas 8, no. 3/1 (June 30, 2016): 170–73. http://dx.doi.org/10.17748/2075-9908-2016-8-3/1-170-173.

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18

Goncharova O. V. and Oyxo'jayeva Z. S. "METHODOLOGY IMPROVEMENT SPEED-STRENGTH FOR YOUNG ATHLETES." International Academy Journal Web of Scholar, no. 7(37) (July 31, 2019): 18–20. http://dx.doi.org/10.31435/rsglobal_wos/31072019/6602.

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The paper discusses the current views on the methodology of development of special speed-strength in the physical education of children 9-10 years engaged in the fight. We used specially selected traditional speed-strength exercises are bringing "explosive" muscle power. These indicators allowed defining options for the development of explosive strength of muscles in young athletes using shock method.

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19

CRONIN, JOHN B., and KEIR T. HANSEN. "STRENGTH AND POWER PREDICTORS OF SPORTS SPEED." Journal of Strength and Conditioning Research 19, no. 2 (May 2005): 349–57. http://dx.doi.org/10.1519/00124278-200505000-00019.

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20

Cronin, John B., and Keir T. Hansen. "Strength and Power Predictors of Sports Speed." Journal of Strength and Conditioning Research 19, no. 2 (2005): 349. http://dx.doi.org/10.1519/14323.1.

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21

Miao, M., F. Ning, and Y. How. "Cotton-sliver Strength and Withdrawal-speed Limit." Journal of the Textile Institute 89, no. 3 (January 1998): 468–79. http://dx.doi.org/10.1080/00405009808658633.

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22

Normand., M. J. A. "ON THE STRENGTH OF HIGH-SPEED VESSELS." Journal of the American Society for Naval Engineers 14, no. 4 (March 18, 2009): 1186–232. http://dx.doi.org/10.1111/j.1559-3584.1902.tb03419.x.

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23

Schellin, T. E., and A. Perez de Lucas. "Longitudinal strength of a high-speed ferry." Applied Ocean Research 26, no. 6 (August 2004): 298–308. http://dx.doi.org/10.1016/j.apor.2005.08.004.

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24

Suliga, M. "The Influence of the High Speed Multipass Drawing Process on the Fatigue Strength of High Carbon Steel Wires / Wpływ Wielostopniowego Procesu Ciągnienia Z Dużymi Prędkościami Na Wytrzymałość Zmęczeniową Drutów Ze Stali Wysokowęglowej." Archives of Metallurgy and Materials 57, no. 4 (December 1, 2012): 1171–78. http://dx.doi.org/10.2478/v10172-012-0131-3.

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In this work the influence of the drawing speed on fatigue strength of high carbon steel wires has been assessed. The drawing process of φ5.5 mm wires to the final wire of φ1.6 mm was conducted in 11 passes, in industrial conditions, by means of a modern Koch multi-die drawing machine. The drawing speeds in the last passes were: 5, 10, 15 and 20 m/s. For φ1.6 mm wires the investigation of fatigue strength has been carried out. In order to explain the effect of drawing speed on fatigue strength of rope wires, the roughness of drawn wires have been also determined. In addition, the numerical analysis of the drawing process on the base of Drawing 2D in which distribution of redundant strain, has been shown. The data of investigations prove the favourable effect of high drawing speed on fatigue strength of drawn wires. It was found that the better fatigue strength of wires drawn at the speed of 20 m/s compared to the wires drawn at the speeds of 5-15 m/s is associated with a better geometric structure of the surface of those wires. In addition to the high fatigue strength of the wires drawn with high speed is related to theirs higher redundant strain. The obtained data investigation can be applied in wire industry while implementing the new technologies of high speed drawing process of high carbon steel wires.

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Vetrivel Sezhian, M., K. Giridharan, D. Peter Pushpanathan, G. Chakravarthi, B. Stalin, Alagar Karthick, P. Manoj Kumar, and Murugesan Bharani. "Microstructural and Mechanical Behaviors of Friction Stir Welded Dissimilar AA6082-AA7075 Joints." Advances in Materials Science and Engineering 2021 (September 21, 2021): 1–13. http://dx.doi.org/10.1155/2021/4113895.

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In this research, microstructural events and mechanical behaviors in dissimilar friction stir welding (FSW) of aluminium (Al) alloy AA6082-AA7075 joints have been evaluated to apply aerospace, defense, and military sectors. FSW parametric effects have a more significant impact on the mechanical performances and microstructure of produced joints. FSW tool rotational speed, welding speed, and tool plunge speed were chosen to make the weld joints. The rotational tool speeds of 1600 rpm and 2300 rpm, welding speeds of 40 mm/min and 60 mm/min, and tool plunge speeds of 20 mm/min and 30 mm/min were set as the upper and lower limits. A constant axial force of 5 kN was maintained throughout the joint fabrication process. A taper pin-profiled tool was utilized to produce the butt welded joints. Mechanical properties of microhardness, tensile strength, yield strength, elongation, and bending strength of the joints were analyzed. The response of the stir zone microstructure to processing parameters was evaluated using optical microscopy (OM) and fractographic analysis of a tensile specimen shown by scanning electron microscope (SEM). The weld joints produced at 2300 rpm, tool traveling rate of 40 mm/min, and tool plunge speed of 30 mm/min showed the greatest tensile strength of the 191 MPa hardness of 145 Hv at the weld center and also the maximum bending strength of 114.23 N/mm2 was achieved. The lowest bending strength of 25.38 N/mm2 was obtained at 1600 rpm with 60 mm/min due to inappropriate mixing of the base metals and poor joint quality. Furthermore, this study revealed that a higher tool plunge speed facilitates the formation of equiaxed grains in the thermomechanically affected zone (TMAZ) on the advancing side (AS). Additionally, the increment in tool rotational speed significantly improved the tensile strength, weld joint quality, and joint efficiency.

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DiLiberto, Frank E., Steven L. Haddad, Daniel H. Aslan, and Anand M. Vora. "Total Ankle Arthroplasty: Is Ankle Plantarflexion Strength Important?" Foot & Ankle Orthopaedics 4, no. 4 (October 1, 2019): 2473011419S0002. http://dx.doi.org/10.1177/2473011419s00020.

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Category: Ankle Arthritis Introduction/Purpose: Ankle push off power, which requires gastroc-soleus muscle strength, is a critical aspect of healthy gait and increases as gait speed increases. It is therefore surprising that one-to-two-year outcomes following total ankle arthroplasty (TAA) include improved gait speed but deficient ankle power. One possible explanation for low ankle power following TAA is ankle plantarflexion weakness. Information on plantarflexion strength is extremely limited in people before or after TAA. Evaluating plantarflexion strength may inform postoperative expectations and guide rehabilitation programs. The purpose of this study was to evaluate the change in ankle plantarflexion strength, ankle power during gait, and gait speed before and after TAA in people with end-stage ankle arthritis, and in comparison to a healthy matched control group. Methods: Twenty-five participants were included in this prospective case-control study. TAA group participants (n = 13) [mean (SD): Age 60.9 (15.3) years; BMI 30.53 (5.5) Kg/m2; 85% male] with end-stage ankle arthritis who received a TAA were evaluated preoperatively and six months postoperatively. Performance of adjunct soft tissue procedures were patient specific (5/13 participants received tendo-achilles lengthening). All patients received formal physical therapy. Healthy control participants (n=12) were matched to the TAA group on age, gender and BMI. Ankle peak isokinetic plantarflexion strength (torque at 60 and 120 degrees/second; Nm/kg) was measured with an instrumented dynamometer. Peak ankle power (joint torque x segmental velocity; W/kg) was calculated via three-dimensional multi-segment foot motion analysis while participants walked barefoot over a force plate at controlled speeds. Gait speed (m/s) was measured with the Six-Minute Walk Test. Appropriate nonparametric comparisons were made to evaluate differences across time, between limbs, and between groups. Results: Compared to preoperative values, involved limb ankle strength was preserved at 60 and 120 degrees/second following TAA (both p > 0.59). Postoperative involved limb ankle strength at both speeds were 37-56% lower than the non-involved limb and control group (all p < 0.05) (Figure 1). Similarly, involved limb ankle power was preserved following TAA (p = 0.43), but remained at least 38% lower than the non-involved limb or control group (both p < .01). A subset analysis revealed that TAA participants with tendo-achilles lengthening had 25-33% less involved limb postoperative ankle power and strength than TAA participants without tendo-achilles lengthening. Interestingly, gait speed increased following TAA (p = 0.01) and was similar to control group speeds [TAA 1.5 vs. Control 1.6 m/s; p = 0.59]. Conclusion: Robust improvements in gait speed were observed following TAA. These values approached normative gait speed in spite of diminished ankle strength and power. Ankle plantarflexion weakness reduces the capacity to generate ankle power during gait, regardless of possible contributing factors (i.e. preexisting atrophy/weakness, tendo-achilles lengthening). Accordingly, improvements in gait speed were likely linked to proximal joint compensations (i.e. hip, knee). The long term consequences of plantarflexion weakness may negatively affect implant loading. Study findings provide new information and point to the importance of targeting strength during postoperative TAA rehabilitation, potentially adjusting strategies for patients receiving soft tissue lengthening procedures.

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Men, Yanhua. "SCIENTIFIC TRAINING OF SPORTS MEDICINE FOR BALANCE OF KNEE JOINT MUSCLE STRENGTH OF ATHLETES." Revista Brasileira de Medicina do Esporte 27, no. 5 (September 2021): 498–503. http://dx.doi.org/10.1590/1517-8692202127042021_0086.

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ABSTRACT Introduction: As skiers need to complete their movements in high mountains and snow, the athlete's landing's stability is directly related to the movement's success. The stable landing action wins high scores for the athletes’ participating actions and protects their safety. Objective: This article analyzes the characteristics of lower limb muscle strength and static balance ability of female freestyle skiing aerials athletes to provide athletes with targeted strength training, evaluation of muscle effects after training, and athlete selection to provide a scientific basis valuable Theoretical reference. Methods: The paper uses isokinetic testing and balance testing methods to study the characteristics of the hip and knee flexor and extensor strengths of the Chinese great female freestyle skiing aerials athletes and the static balance characteristics in four standing positions. Results: The right flexor-extensor force, flexor-extensor force ratio, and average power value of the right hip joint were slightly greater than the left flexor power. The left and right knee joint extensor unit peak weight moments and the left and right average power values were all four indicators. Greater than the flexor, at different test speeds of 60°/s (slow speed) and 240°/s (fast), the peak flexion and extension torque per unit weight, the average power of flexion and extension, the force of flexion and extension, and the average power appear with the increase of the test speed as a significant difference. Conclusions: The research in the thesis recommends reasonable weight control and balanced training of muscle strength, using the condition of moderately increasing exercise speed, to strengthen the training of lower limb extensor strength, provide targeted strength training for athletes, evaluate the muscle effect after training and providing the scientific basis and valuable theoretical reference. Level of evidence II; Therapeutic studies - investigation of treatment results.

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Varma, Ramaraju Ramgopal, Abdullah Bin Ibrahim, and B. Ravinder Reddy. "Evaluating the Strength of the Friction Stir Welded Joints at Various Rotational Speeds." Applied Mechanics and Materials 446-447 (November 2013): 312–15. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.312.

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The present research paper aims in evaluating the strength of the welded AA6351 alloy plates of 6 mm thick by using friction stir welding technique at different rotational speeds The applied welding technique is capable of achieving the mechanical properties of the alloy close to that of the original alloy. In the present investigation, the speeds of the spindle were varied from 1100 rpm to 1500 rpm with a constant transverse speed of 20 mm/min. The tensile strength of the joints is determined by an universal testing machine. The results from the present investigation show that the values of the yield strength were very much closer to the values of the AA6351Alloy prior to welding. It has been found from the experiments that the strength of the joints increases with the increase in the rotational speed; however, the same is decreasing after achieving certain speed.

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Jabbari, Masoud, and Cem C. Tutum. "Optimum Rotation Speed for the Friction Stir Welding of Pure Copper." ISRN Materials Science 2013 (August 6, 2013): 1–5. http://dx.doi.org/10.1155/2013/978031.

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The friction stir welding (FSW) was conducted in the pure copper plates with the thickness of 4 mm in the constant traverse speed of 25 mm/min and five different rotation speeds. Analysis of metallographic images showed that the increasing of the rotation speed results in the increase of grain size in the nugget zone. Vickers hardness tests were conducted on the weld samples and the maximum hardness obtained in rotation speed of 900 rpm. Results of the tensile tests and their comparison with that of the base metal showed that the maximum strength and the minimum elongation are achieved again in this rotation speed. Yield strength and ultimate tensile strength increased with the decrease in grain size in the nugget region, and the yield strength obeyed Hall-Petch relationship. Hence, the hardness values do not follow the relationship.

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Avula, Dhananjayulu, and D. K. Dwivedi. "Effect of Welding Speed on Mechanical Properties of Friction Stir Welded AA 6082-T6 Al Alloy." Applied Mechanics and Materials 877 (February 2018): 98–103. http://dx.doi.org/10.4028/www.scientific.net/amm.877.98.

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In this study the effect of process parameters on mechanical and microstructural properties of similar AA6082-T6 joints produced by friction stir welding was investigated. Different samples were produced by varying the transverse welding speeds of the tool from 19 to 75 mm/min and a fixed rotational speed of 635 rpm. A more uniform hardness values in the nugget zone were observed at 48 mm/min welding speed. The lowest hardness values were recorded on nugget zone at all the welding speeds. The increase in welding speed increases ultimate tensile strength and reaches maximum and further increase in welding speed results decrease in tensile strength were observed. The welded joint has highest joint efficiency (52.33 %) obtained at the welding speed of 48 mm/min. Similarly with the increase in welding speed decrease in the percentage elongation were recorded.

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Young, Paul. "Optimum Performance: Optimal strength training in speed-strength sports: A theoretical approach." National Strength & Conditioning Association Journal 7, no. 6 (1985): 44. http://dx.doi.org/10.1519/0744-0049(1985)007<0044:ostiss>2.3.co;2.

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de Conti, Andrea Cressoni, and Cláudio de Conti. "Effect of Surface Roughness on the Shear and Tensile Strength of Hardwood Adhesive Joints: A Linear Elastic Model." Advanced Materials Research 1088 (February 2015): 750–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.750.

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This study analyzed the bond line strength of Eucalyptus sp. specimens submitted to shear and perpendicular to grain tensile forces, depending on the wood quality machined surface. The woods plans were glued with two different polyvinyl acetate adhesives. The bonding surfaces were milling with three different feed speeds; 6.0, 11.0 and 15.0 m/min, corresponding to the feed per tooth of the cutting tool; 0.86, 1.57 and 2.14 mm, respectively. The specimen types corresponded to the standards according to ABNT NBR 7190/1997. The cutting plane considered only the geometry of milling due to the bond line joint strength. To explain the experimental results, was proposed a linear elastic model to machined wood and bond line. For the two adhesives used, the experimental results suggest that the greatest perpendicular to grain tensile strength and shear strength were obtained to bond surface machined with the intermediate feed speed namely 11 m/min, for others two feed speeds and in the shear strength case, was not observed a distinction between them, in the perpendicular to grain tensile strength, the feed speed 6.0 m/min presented a higher strength than the machined surface with 15.0 m/min. The model reproduces the behavior of the experimentally results obtained for the two tests, and so it can be readily applied as a tool for evaluate the machining feed speed and the bond line joint strength.

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Gant, Оlena, and Roman Golykh. "Characteristics speed-strength and psyhological characteristics of adolescents." Слобожанський науково-спортивний вісник 40, no. 2 (April 30, 2014): 61–66. http://dx.doi.org/10.15391/snsv.2014-2.012.

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Wagman, Dan. "Maximizing Strength, Speed, and Power Through Self-Confidence." STRENGTH AND CONDITIONING JOURNAL 19, no. 3 (1997): 7. http://dx.doi.org/10.1519/1073-6840(1997)019<0007:mssapt>2.3.co;2.

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Struleva, E. V., P. S. Komarov, and S. I. Ashitkov. "Spallation Strength of Titanium at High-Speed Tension." High Temperature 58, no. 5 (September 2020): 744–46. http://dx.doi.org/10.1134/s0018151x20050090.

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Sheppard, Jeremy M. "Strength and Conditioning Exercise Selection in Speed Development." Strength and Conditioning Journal 25, no. 4 (August 2003): 26–30. http://dx.doi.org/10.1519/00126548-200308000-00006.

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Hedrick, Allen. "STRENGTH TRAINING: Literature Review: High Speed Resistance Training." National Strength & Conditioning Association Journal 15, no. 6 (1993): 22. http://dx.doi.org/10.1519/0744-0049(1993)015<0022:lrhsrt>2.3.co;2.

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Tsai, Yuo-Tern, and Yung-Yuan Hsu. "Strength Analysis and Reliability Evaluation for Speed Reducers." IOP Conference Series: Materials Science and Engineering 235 (September 2017): 012002. http://dx.doi.org/10.1088/1757-899x/235/1/012002.

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Maniazhagu, D., Kannadasan, and S. Malar. "EFFECTS OF EXPLOSIVE STRENGTH AND STRENGTH ENDURANCE BASED CIRCUIT TRAINING ON SPEED PERFORMANCE." International Journal of Research -GRANTHAALAYAH 5, no. 8(SE) (August 31, 2017): 76–82. http://dx.doi.org/10.29121/granthaalayah.v5.i8(se).2017.2251.

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The purpose of the study was to find out the effects of explosive strength and strength endurance based circuit training on speed performance. To achieve the purpose of the study, thirty boys’ student in the age group 13 to 14 were selected as subjects at random. The selected subjects were from RCM High School, Natarajapuram, Sivagangai(DT), Tamilnadu. The study was formulated as pre and post-test random group design, in which thirty students were divided into three equal groups. The experimental group-1 (n=10, ESbCT) underwent explosive strength based circuit training, the experimental group-2 (n=10, SEbCT) underwent strength endurance based circuit training and group 3 served as control group (n=10, CG) did not undergo any specific training. In this study, two training programme were adopted as independent variables, i.e., explosive strength based circuit training and strength endurance based circuit training. The speed was selected as dependent variables. The speed was tested by 50 meters run recoded in seconds. The selected two treatment group namely explosive strength based circuit training and strength endurance based circuit training were performed five days in week for the period of six weeks, as per the stipulated training programme. The speed performance was collected before and after the training period. The collected pre and post test data was critically analyzed with apt statistical tool of one way analysis of co variance, for observed the significant adjusted post-test mean difference of three groups. The Scheffe’s post hoc test was used to find out pair-wise comparisons between groups. To test the hypothesis 0.05 level of significant was fixed in this study. The nature of speed highly improved in explosive strength based circuit training than the strength endurance based circuit training.

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Agapiou, J. S. "Evaluation of the Effect of High Speed Machining on Tapping." Journal of Engineering for Industry 116, no. 4 (November 1, 1994): 457–62. http://dx.doi.org/10.1115/1.2902128.

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This paper summarizes tapping characteristics at speeds as high as 9,000 rpm (180 m/min surface speed) as compared to traditional tapping done at speeds from 500 to 1,500 rpm (20–30 m/min). High speed tapping was achieved by synchronizing the spindle rotation and the feed motion of a specially built machine at extremely high speeds and acceleration/deceleration rates. This investigation analyzes the performance of roll and cut tap geometries in the high speed tapping of 319 aluminum. The torque required by the different tap geometries at several speeds and percent threads combination is evaluated. The relationship between pretapped hole diameter and minor diameter of the thread and the estimation of percent thread are analyzed. The thread quality generated at high speeds is also evaluated. It is shown that the cutting speed does not affect the steady state torque and the shear strength. The torque for roll forming taps is higher than that for cut taps. The shear strength of roll forming threads increased with percent thread.

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Pedapati, Srinivasa Rao, G. Vimalan, Mokhtar Awang, and A. M. A. Rani. "Effect of Tool Parameters on Mechanical Properties of Friction Stir Welded Aluminum Alloy." Applied Mechanics and Materials 786 (August 2015): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amm.786.111.

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The mechanical properties of weld joints in Friction Stir Welding (FSW) are influenced by the welding parameters such as rotational speed, tool geometry and welding speed. In the present study, three different tool profiles have been used to weld the joints with three different rotational speed and two welding speeds. Full factorial experiments have been conducted using DoE. The mechanical properties of weld joint were evaluated by means of tensile tests and hardness test at room temperature. The experiment result shows that the average highest number of hardness was 40.06 HRB with square tool at a rotational speed of 2000rpm while lowest hardness was 30.84 HRB with cylindrical threaded tool at rotational speed of 1800rpm. The maximum tensile strength of the joint obtained is 265 M Pa which is close to base material strength. It is observed from experimental results that joints made by square tool yield more strength compared to other tool profiles.

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Russky, Evgeny, and Pavel Kosykh. "STRESS-STRAIN BEHAVIOR OF BLADES WITH NON-ENTIRE STRUCTURE FOR MINE AXIS FLOW FAN." Interexpo GEO-Siberia 2, no. 4 (2019): 282–89. http://dx.doi.org/10.33764/2618-981x-2019-2-4-282-289.

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The work is devoted to development issue of construction of working wheel blades satisfying conditions of strength when peripheral speed at end of the blades is more than 140 m/s. Due to high rotational speeds cast blades do not have required strength, therefore it is important to develop light-weight construction allowing to increase rotational speed of fan rotor. The calculations of strength of blades with various honeycomb structure are carried out with finite-element method at software. Dependences of stress and strain distributions on rotational speed of the rotor. Development of core rod of working wheel blade of axis flow fan of VOD series in form of honeycomb structure from aluminum alloy AK7 allows to increase rotational speed of the fan in 1.8 times. Consequently, it allows to increase productivity of the fan in the same times.

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Adel, K. M. "Estimation of the Mechanical Properties and Temperature Distribution in Friction Stir Welding Technique of Aluminum Alloys." Materials Science Forum 773-774 (November 2013): 803–11. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.803.

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Friction stir welding of AA 7020-T6 aluminum alloys, 5 mm thick plate is an Al-Zn-Mg grade alloy of 7XXX series heat treatable of medium strength alloys and employed for welded engineering structural components. The effect of FSW parameters (rotational speeds and travel speeds) on joint strength and welding zone dimensions have been investigated experimentally. Four different rotational speeds are used: 450, 560, 710 and 900 r.p.m. with three travel speeds 16, 25 and 40 mm.min-1. The experimental investigation included tensile test and weld pool geometry determination. It was found the that best welding conditions for FSW was the weldments which have 247 Mpa yield strength, 340 MPa ultimate tensile strength, 7.3% elongation, 11020N bending forces for both face and root and hardness value ranging from (133-138) Hv 0.05 for the different welding regions under the optimal welding conditions at a rotational speed of 900 r.p.m. and travel speed of 25mm.min-1.

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Duan, Chun Zheng, Min Jie Wang, and Tao Dou. "Microscopic Examination of Primary Shear Zone in High Speed Machining of Hardened High Strength Steel." Advanced Materials Research 97-101 (March 2010): 1887–90. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1887.

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The microstructure observation and microhardness measurement were performed on the adiabatic shear bands in primary shear zone in the serrated chips formed during high speed machining of two tempering hardness of hardened high strength steel under different cutting speeds by optical microscope, SEM, TEM and microhardness tester. The investigation results show that two types of adiabatic shear bands are formed as cutting speed increases. One is deformed band with heavy elongated microstructures generated under lower cutting speed, another is transformed band with fine grains under higher cutting speed. The increase of the cutting speed little influences on the microhardness in the transformed bands, and the microhardness in deformed band results from strain hardening, whereas transformation hardening leads to very high microhardness in transformed band.

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Meengam, Chaiyoot, Muhamad Tehyo, Prapas Muangjunburee, and Jessada Wannasin. "Dissimilar Materials Joining between SSM 356-T6 and AA6061-T651 by Friction Stir Welding." Applied Mechanics and Materials 372 (August 2013): 478–85. http://dx.doi.org/10.4028/www.scientific.net/amm.372.478.

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The aim of this research is to study the influence of welding parameters on the metallurgical and mechanical properties of friction stir welded butt joints of dissimilar aluminum alloy sheets between Semi-Solid Metal (SSM) 356-T6 and AA6061-T651 by Friction Stir Welding (FSW). The base materials of SSM 356-T6 and AA6061-T651 were located on the advancing side (AS) and on the retreating side (RS) respectively. The base materials were joined under different tool rotation speeds and welding speeds. The material flows from SSM 356 and AA6061-T651 were clearly visible in the weld nugget. In addition, the mixtures of fine equiaxed grain were observed in the stir zone. The increase in tool rotation speed results in the increase in tensile strength of the joints. As for welding speed associated with various tool rotation speeds, an increase in the welding speed affected lesser the base materials tensile strength up to an optimum value; after which its effect increased. Tensile elongation was generally greater at greater tool rotation speed. An averaged maximum tensile strength of 206.3 MPa was derived for a welded specimen produced at the tool rotation speed of 2,000 rpm associated with the welding speed of 80 mm/min. In the weld nugget, higher hardness was observed in the stir zone than in the thermo-mechanically affected zone. Away from the weld nugget, hardness levels increased back to the levels of the base materials.

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Luna, Carlos Fernando, Fernando Franco Arenas, Victor Ferrinho Pereira, and Julián Arnaldo Ávila. "Mechanical and Fatigue Strength Assessment of Friction Stir Welded Plates of Magnesium Alloy AZ31B." Soldagem & Inspeção 23, no. 1 (March 2018): 52–59. http://dx.doi.org/10.1590/0104-9224/si2301.06.

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Abstract Light-alloys play a significant role in saving weight in automotive and aerospace industries; however, a few joining methods guarantee mechanical and fatigue strengths for high performance application. Even conventional arc welding processes do not offer constant quality joints. Therefore, this study uses an alternative solid-state welding process, friction stir welding (FSW), to analyze post processing microstructures and assess mechanical and fatigue strength. Magnesium alloy AZ31B plates were welded using different welding parameters in a dedicated FSW machine. The effect of the spindle speed (ω) and welding speed (ν) on the microstructure, the tensile strength and fatigue were studied. The stirred zone (SZ) at the FS-welded joints presented a microstructure composed by homogeneous equiaxial grains, refined by dynamic recrystallization. A rise in grain size, weld bead width, tensile and fatigue strengths with the increase of speed ratio (ω/ν) were observed. Results of the fatigue and mechanical strength here presented outperformed results from welds made with conventional milling machines.

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Dharani Kumar, S., and S. Sendhil Kumar. "Investigation of mechanical behavior of friction stir welded joints of AA6063 with AA5083 aluminum alloys." Mechanics and Mechanical Engineering 23, no. 1 (July 10, 2019): 59–63. http://dx.doi.org/10.2478/mme-2019-0008.

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Abstract Aluminum alloy finds its applications in various sectors of engineering. This paper discusses the investigation of mechanical characteristics of butt weld joints of aluminum alloy AA6063 along with AA5083. An experiment was conducted for different tool rotational speeds of 600 rpm, 800 rpm and 1000 rpm. Specifications of friction stir welding machine were 4 kN axial load and welding speed of 40 mm/min. Friction stir welded (FSW) joints of higher tensile strength, lower flexural strength and lower impact strength with maximum hardness, for the work piece fabricated at 1000 rpm using a high speed steel tool with a cylindrical profile was observed. Better understanding of the effect of tool rotational speed and mechanical properties was illustrated through the experimental result.

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Ghetiya, Nilesh D., and Kaushik M. Patel. "Welding speed effect on joint properties in air and immersed friction stir welding of AA2014." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 5 (February 6, 2017): 897–909. http://dx.doi.org/10.1177/0954405417690555.

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In immersed friction stir welding, the workpiece is fully immersed in the water during welding. This work illustrates the effect of welding speed on mechanical properties and microstructure. Friction stir welding joints were produced using AA2014-T6 at different welding speeds ranging from 80 to 125 mm/min with constant rotational speed of 1000 r/min in air and immersed water conditions. Results revealed that with an increase in welding speed, the tensile strength of joint increased, this is due to a reduction in heat input while using both air and immersed friction stir welding, which in turn reduces the dissolution of strengthening precipitates. Microstructure result showed that grain size decreased with an increase in welding speed due to less heat input at increased welding speed. The dissolution of strengthening precipitates weakened with an increase in welding speed in both air and immersed friction stir welding, leading to an increase in hardness value at the nugget zone. Maximum tensile strength was obtained at a welding speed of 100 mm/min in immersed friction stir welding and was around 17% higher compared with a maximum tensile strength obtained using air friction stir welding.

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Kovaleski, John E., Robert J. Heitman, Damon P. S. Andrew, Larry R. Gurchiek, and Albert W. Pearsall. "Relationship between Closed-Linear-Kinetic-and Open-Kinetic-Chain Isokinetic Strength and Lower Extremity Functional Performance." Journal of Sport Rehabilitation 10, no. 3 (August 2001): 196–204. http://dx.doi.org/10.1123/jsr.10.3.196.

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Context:Isokinetic strength and functional performance are used to assess recovery after rehabilitation. It is not known whether low-speed closed-linear-kinetic isokinetic muscle strength correlates with functional performance.Objective:To investigate the relationship between linear closed (CKC) and open (OKC) concentric isokinetic strength of the dominant lower-limb extensors and functional performance.Design:Correlational analysis.Setting:University laboratory.Participants:Thirty uninjured men and women (age = 20.9 ± 2.4 years).Main Outcome Measures:Peak CKC and OKC isokinetic strength and best score from a shuttle run for time, single-leg vertical jump, and single-leg hop for distance.Results:Neither lower-limb CKC nor OKC isokinetic strength measured at low speeds correlated highly with performance on the functional tasks of jumping, hopping, and speed/agility.Conclusions:Although the basis of both closed and open isokinetic strength must be appreciated, they should not be the only determinants of functional performance.

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Ochiai, Shojiro, Yuushi Sakai, K. Sato, T. Ueda, Kohei Morishita, Hiroshi Okuda, Masashi Tanaka, et al. "Tensile and Bending Behavior of Melt Growth Al₂O₃/YAG Composite at Ultra High Temperatures (1773-2023K)." Materials Science Forum 475-479 (January 2005): 1091–96. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1091.

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The deformation and fracture behavior at 1773-2023K of the unidirectionally solidified eutectic Al2O3/YAG (Yttrium-Aluminum Garnet with the composition of Y3Al5O13) ceramic composite was investigated. The stress-stain curve and strength of unnotched and notched specimens, measured by bending and tensile tests, showed that (a) both unnotched and notched specimens fractured in a brittle manner at low temperatures and at high displacement speeds, but in a ductile manner at high temperatures and at low displacement speeds, and (b) the notched strength increased, reaching maximum, and decreased with increasing temperature and decreasing displacement speed. The increase in the notched strength with increasing temperature and decreasing displacement speed up to the maximum value was accounted for by the increase in plastic zone size ahead of the notch, and the decrease with further increasing temperature and decreasing displacement speed by the loss of the stress carrying capacity of the yielded ligament, based on the finite element analysis.

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Journal articles on the topic 'Speed strength'

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