Готові списки джерел за темами / Fiber harness

Добірка наукової літератури з теми "Fiber harness"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Fiber harness"

Srisuwan, Sawitri, and Pranee Chumsamrong. "The Effects of Fiber Architecture and Fiber Surface Treatment on Physical Properties of Woven Sisal Fiber/Epoxy Composites." Advanced Materials Research 410 (November 2011): 39–42. http://dx.doi.org/10.4028/www.scientific.net/amr.410.39.

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The aim of this work was to investigate the effects of fiber architecture and fiber surface treatment on flexural and impact properties of woven sisal fiber/epoxy composites. The woven sisal fibers with three different weave types including plain weave (P-weave), harness satin weave (S-weave) and right hand twill weave (R-weave) were used. For untreated fiber/epoxy composites, the fiber contents in the composite were 0, 5, 10 and 15% by weight (%wt). The untreated S-weave sisal fiber/epoxy composites showed the best overall properties and the composites with 15% fiber loading showed the highest properties. When compared to pure epoxy, flexural strength, flexural modulus and impact strength of the composite with 15% wt fiber increased by 4.5%, 60.6% and 150% respectively. Therefore, the composite of 15% wt silane treated S-weave and epoxy was prepared in order to study the effect of fiber surface treatment. The results showed that the composite containing 15% wt silane treated fiber possessed nearly the same properties with the untreated fiber/epoxy composite.

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Vicki., W. V., Taness Santhana Rajah, and S. Selvakumar. "Synthesis of cellulose from office waste paper and the effect on mechanical properties of cellulose/kenaf/epoxy composite." MATEC Web of Conferences 189 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201818905002.

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Environmental and open public health aspects have an important and increasing role, especially in the exploration of natural fibers from recycle materials. The aim of this study is to synthesis cellulose from office waste paper and use it as a reinforcement filler to develop biocomposites. Epoxy reinforced kenaf fiber and cellulose composite were prepared in this study using polymer casting technique consisting of grinded kenaf fibre (natural fibre) 5% and epoxy 95% as reinforcement element. Cellulose was synthesized from recycled office papers and used as a filler to prepare cellulose/kenaf reinforced epoxy composite. Effect of cellulose to the mechanical properties of the composite were investigated. Samples were fabricated by weight percentage of 0%, 0.5%, 1.0%, 1.5% and 2.0% of cellulose content. For mechanical properties impact test, Rockwell harness and tensile testings were conducted.

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Widrick, Jeffrey J., and Robert H. Fitts. "Peak force and maximal shortening velocity of soleus fibers after non-weight-bearing and resistance exercise." Journal of Applied Physiology 82, no. 1 (January 1, 1997): 189–95. http://dx.doi.org/10.1152/jappl.1997.82.1.189.

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Widrick, Jeffrey J., and Robert H. Fitts. Peak force and maximal shortening velocity of soleus fibers after non-weight-bearing and resistance exercise. J. Appl. Physiol. 82(1): 189–195, 1997.—This study examined the effectiveness of resistance exercise as a countermeasure to non-weight-bearing-induced alterations in the absolute peak force, normalized peak force (force/fiber cross-sectional area), peak stiffness, and maximal shortening velocity ( V o) of single permeabilized type I soleus muscle fibers. Adult rats were subjected to one of the following treatments: normal weight bearing (WB), non-weight bearing (NWB), or NWB with exercise treatments (NWB+Ex). The hindlimbs of the NWB and NWB+Ex rats were suspended for 14 days via tail harnesses. Four times each day, the NWB+Ex rats were removed from suspension and performed 10 climbs (∼15 cm each) up a steep grid with a 500-g mass (∼1.5 times body mass) attached to their tail harness. NWB was associated with significant reductions in type I fiber diameter, absolute force, normalized force, and stiffness. Exercise treatments during NWB attenuated the decline in fiber diameter and absolute force by almost 60% while maintaining normalized force and stiffness at WB levels. Type I fiber V oincreased by 33% with NWB and remained at this elevated level despite the exercise treatments. We conclude that in comparison to intermittent weight bearing only (J. J. Widrick, J. J. Bangart, M. Karhanek, and R. H. Fitts. J. Appl. Physiol. 80: 981–987, 1996), resistance exercise was more effective in attenuating alterations in type I soleus fiber absolute force, normalized force, and stiffness but was less effective in restoring type I fiber V oto WB levels.

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Ab-Rahman. "COST-EFFECTIVE WIRE-HARNESS MODEL BY USING POLYMER OPTICAL FIBER." Journal of Computer Science 9, no. 7 (July 1, 2013): 935–42. http://dx.doi.org/10.3844/jcssp.2013.935.942.

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Aghaei, Mohammad, Mahmood M. Shokrieh, and Reza Mosalmani. "Effect of warp and fill-fiber volume fractions on mechanical properties of glass/epoxy woven fabric composites." Journal of Composite Materials 54, no. 24 (April 7, 2020): 3501–13. http://dx.doi.org/10.1177/0021998320914002.

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Mechanical properties of woven fabric composites are influenced by fabric geometry and harness. In the present research, woven fabric composites made of ML-506 epoxy resin and E-glass woven fabrics with three different fabric geometries (harnesses of 2, 5, and 8) were studied experimentally. The new concepts of warp and fill-fiber volume fractions were introduced. Based on these new concepts, a micromechanical model for predicting the stiffness and strength of composites made of woven fabrics was developed. An experimental program was conducted to evaluate the present model and the new concepts of warp and fill-fiber volume fractions. The results obtained by the new micromechanical model have been compared with the conducted experimental results as well as the experimental data available in the literature, and very good correlations were obtained.

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Choudhry, RS, Kamran A. Khan, Sohaib Z. Khan, Muhammad A. Khan, and Abid Hassan. "Micromechanical modeling of 8-harness satin weave glass fiber-reinforced composites." Journal of Composite Materials 51, no. 5 (July 28, 2016): 705–20. http://dx.doi.org/10.1177/0021998316649782.

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This study introduces a unit cell-based finite element micromechanical model that accounts for correct post cure fabric geometry, in situ material properties and void content within the composite to accurately predict the effective elastic orthotropic properties of 8-harness satin weave glass fiber-reinforced phenolic composites. The micromechanical model utilizes a correct post cure internal architecture of weave, which was obtained through X-ray microtomography tests. Moreover, it utilizes an analytical expression to update the input material properties to account for in situ effects of resin distribution within yarn (the yarn volume fraction) and void content on yarn and matrix properties. This is generally not considered in modeling approaches available in literature and in particular, it has not been demonstrated before for finite element micromechanics models of 8-harness satin weave composites. The unit cell method is used to obtain the effective responses by applying periodic boundary conditions. The outcome of the analysis based on the proposed model is validated through experiments. After validation, the micromechanical model was further utilized to predict the unknown effective properties of the same composite.

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Ogasawara, Toshio, Akinori Yoshimura, Takashi Ishikawa, Ryuya Takahashi, Nobuyuki Sasakib, and Takeshi Ogawa. "Interlaminar Fracture Toughness of 5 Harness Satin Woven Fabric Carbon Fiber/Epoxy Composites." Advanced Composite Materials 21, no. 1 (February 1, 2012): 45–56. http://dx.doi.org/10.1163/156855112x626219.

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Lucchesi, Arthur J., Jack C. Hay, and Kenneth W. White. "The influence of an oxidation inhibitor on the elevated temperature fracture resistance of carbon/carbon composites." Journal of Materials Research 7, no. 7 (July 1992): 1795–804. http://dx.doi.org/10.1557/jmr.1992.1795.

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This fracture study evaluates the role of a fiber/matrix interfacial glass on the toughening of two different carbon/carbon (C/C) composites. Both composites incorporate a two-dimensional layup of 8-harness satin weave continuous fiber fabric, but differ in several aspects, the most significant of which is the presence of an oxidation inhibitor in one of these. The fracture behavior of both materials was determined in three-point flexure at 20 through 1650 °C. Microstructural studies indicate that the nonhomogeneous distribution of the oxidation inhibitor within the fiber bundles controls the fracture behavior. Electron microprobe results indicate a high concentration of the glass oxidation inhibitor associated with the inter-bundle matrix, while the intra-bundle matrix is composed primarily of carbon. Accordingly, debonding along the inter-bundle interfaces characterizes the oxidation inhibited composite, whereas the nonoxidation inhibited samples debond by individual fibers. Both materials exhibit strongly rising R-curves throughout the test temperature range. At the higher test temperatures the oxidation inhibited C/C shows the greatest cumulative toughening component, although at a lower value of the fracture toughness. This is consistent with the observed increase in the percentage of fibers that experience individual pullout at the higher temperatures.

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Oladele, I. O., A. D. Akinwekomi, I. O. Ibrahim, M. H. Adegun, and S. I. Talabi. "Assessment of Impact Energy, Wear Behavior, Thermal Resistance and Water Absorption Properties of Hybrid Bagasse Fiber/CaCO3 Reinforced Polypropylene Composites." International Polymer Processing 36, no. 2 (May 1, 2021): 205–12. http://dx.doi.org/10.1515/ipp-2020-3984.

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Abstract To harness the inherent advantages of both synthetic and natural reinforcements, mercerized bagasse fibers (BF) and particulate calcium carbonate (CaCO3) were utilized as a complementing reinforcement for the fabrication of bagasse fiber/calcium carbonate (BF/CaCO3) polypropylene composites. Two sets of composites were produced – one with mercerized BF/CaCO3 and the other with unmercerized BF/ CaCO3. The effect of reinforcement loading on the impact energy, wear behavior, thermal resistance and water absorption properties of the composites were studied. Results showed that the mercerized BF/CaCO3 hybrid reinforced polypropylene composites exhibited significant increase in impact energy and offered better resistance to weight loss during wear test. Similarly, the thermal resistance of the mercerized composites was higher than their corresponding unmercerized composites. Additionally, water absorption in mercerized composites was highly resisted than in unmercerized samples. These results indicated that mercerization treatment and reinforcement hybridization improved the impact energy, wear, thermal resistance and water ingress resistance of hybrid fiber/ particulate reinforced polypropylene composites.

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Park, Dong-Cheol, Tianyu Yu, Soo-Jeong Park, Do-Hoon Shin, and Yun-Hae Kim. "Prediction of permeability of five-harness satin fabric by a modified Kozeny constant determined from experiments." Functional Composites and Structures 4, no. 1 (January 14, 2022): 015001. http://dx.doi.org/10.1088/2631-6331/ac46fa.

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Abstract Permeability is a critical parameter not only in flow simulation analysis but also in liquid composite molding process. When a liquid resin is infused into a dry preform, the impregnation is mainly characterized by the permeability. The permeability of a dry preform can be obtained through theoretical and experimental methods. In the theoretical estimation of permeability, the effects of fiber arrangement as well as fabric type and form for various types of preforms are not sufficiently reflected in the calculation. Thus, there is a gap between the theoretical and experimental permeability. Recently, experimental determination has been gaining considerable attention as a mean to obtain accurate permeability values; however, it requires a number of trials. In this study, the permeability of the Hexforce G0926 5HS (five-harness satin) carbon fabric preform is estimated using representative theoretical prediction models, the Gebart and Kozeny–Carman equations. In addition to the Kozeny–Carman permeability (using the Kozeny constant values from literature), the Kozeny constant obtained through experiments was used to obtain a modified Kozeny–Carman permeability. All three calculated permeabilities were compared and verified with the fabric manufacturer’s reference value. The results showed that the modified Kozeny–Carman permeability using the experimentally determined Kozeny constant was closest to the reference value at 57% fiber volume fraction. Further, the predicted permeability was compared with other experimental permeability values from literature over the 40%–65% range of fiber volume fraction. We found that the modified Kozeny–Carman permeability once again came closest to the literature values. Finally, an optimized fitting equation was proposed to replace the Kozeny–Carman equation for predicting the permeability of Hexforce G0926 5HS carbon fabric over the 40%–65% fiber volume fraction range.

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Більше джерел

Дисертації з теми "Fiber harness"

Чорний, Владислав Олександрович. "Лазерний вимірювач швидкості кровотоку". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/43661.

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Обсяг звіту становить 56 сторінок, міститься 25 ілюстрацій, 17 таблиці. Загалом опрацьовано 22 джерел. Актуальність: контроль та швидка оцінка характеристик параметрів кровотоку є важливим атрибутом правильної діагностики пацієнта, а в особливості неівазивним методом вимірювання, так як сприйняття організму чужорідного тіла може вести до неприємних наслідків. Мета: недорогий та надійний лазерний вимірювач швидкості кровотока, як для лабораторних дослідів, так і для повсякденного контролю пацієнта. Завдання: 1. Огляд та аналіз літератури, що стосується лазерних вимірювачів швидкості кровотоку. 2. Огляд та аналіз інтелектуальної власності сучасних лазерних вимірювачів швидкості кровотоку. 3. Побудова оптично-функціональної схеми приладу. 4. Підбір елементів для реалізації швидкоміра. 5. Моделювання лазерного вимірювача кровотоку.
The volume of the report is 56 pages, contains 25 illustrations, 17 tables. In general, 22 sources were processed. Relevance: control and rapid assessment of the characteristics of blood flow parameters is an important attribute of proper diagnosis of the patient, and in particular a non-invasive method of measurement, as the perception of a foreign body can lead to unpleasant consequences. Purpose: inexpensive and reliable laser blood flow meter, both for laboratory experiments and for daily monitoring of the patient. Task: 1. Review and analysis of the literature related to laser blood flow meters. 2. Review and analysis of intellectual property of modern laser blood flow meters. 3. Construction of the optical-functional scheme of the device. 4. Selection of elements to the optical-functional scheme of the flowmeter. 5. Simulation of a laser blood flow meter.

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Книги з теми "Fiber harness"

V, Nagpal, and Lewis Research Center, eds. Probabilistic modeling of high-temperature material properties of a 5-harness 0/90 Sylramic fiber/CVI-SiC/MI-SiC woven composite. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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The 2006-2011 World Outlook for Copper Apparatus Wire, Cord, and Flexible Cord Sets Made in Plants That Draw Wire Excluding Wiring Harnesses and Fiber Optic. Icon Group International, Inc., 2005.

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The 2006-2011 World Outlook for Apparatus Wire and Cord and Flexible Cord Sets Made from Purchased Insulated Wire Excluding Wiring Harnesses and Fiber Optic Types. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Apparatus Wire and Cord and Flexible Cord Sets Made from Purchased Insulated Wire Excluding Wiring Harnesses and Fiber Optic Types. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 World Outlook for Aluminum Apparatus Wire and Cord and Flexible Cord Sets Made in Aluminum Rolling and Drawing Plants Excluding Wiring Harnesses and Fiber Optic. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Aluminum Apparatus Wire and Cord and Flexible Cord Sets Made in Aluminum Rolling and Drawing Plants Excluding Wiring Harnesses and Fiber Optic. Icon Group International, Inc., 2005.

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Частини книг з теми "Fiber harness"

Fadzullah, S. H. Sheikh Md, and Zaleha Mustafa. "Fabrication and Processing of Pineapple Leaf Fiber Reinforced Composites." In Materials Science and Engineering, 876–93. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1798-6.ch035.

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There is an increasing interest worldwide in the use of Pineapple Leaf Fibers (PALF) as reinforcements in polymer composites, since this type of natural fiber exhibit attractive features such as superior mechanical, physical and thermal properties, thus offer potential uses in a spectrum of applications. PALF contains high cellulose content (between 70-82%) and high crystallinity. However, being hydrophilic, it posed a compatibility issue particularly in a hydrophobic polymeric matrix system. Thus, their shortcoming need to be addressed to ensure good interfacial bonding at the fibers/matrix interphase before their full potential can be harnessed. This chapter summarized some of the important aspects relating to PALF and its reinforced composites, particularly the main characteristics of the fiber, extraction and pre-treatment process of the fibers. Following this, discussions on the available fabrication processes for both short and continuous long PALF reinforced composites are presented.

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Тези доповідей конференцій з теми "Fiber harness"

MCCOY, BRUCE. "Reliability in fiber optic cable harness manufacturing." In Digital Avionics Systems Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-3931.

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Golestanian, Hossein. "Resin Velocity and Pressure Distribution in Resin Transfer Molding of a Composite Cylinder." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72359.

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Resin Transfer Molding (RTM) process in the manufacturing of a composite cylinder is investigated. Resin flow in the woven fiber mat is modeled as flow through porous media to determine resin velocity and pressure distribution along the part. Five-harness carbon and eight-harness fiberglass mats with epoxy resin composites are investigated. Fiber mat permeability for the two fiber types are determined experimentally. These values are then employed in numerical models to simulate the injection cycle of the RTM process. ANSYS finite element software is used to perform the analysis. The results indicate that resin velocity in fiberglass mats is almost six times the velocity in carbon fiber mats. This is due to the higher permeability of fiberglass mats. The sharp drop in the resin velocity into carbon fibers indicates that flow problems will exist in the manufacturing of large carbon/epoxy parts with RTM processes.

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Liu, K. C., Cris Hiche, and Aditi Chattopadhyay. "Low Speed Impact of Woven Fiber Composites Including Fiber Bragg Grating Sensors." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1418.

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In this paper, the dynamic Fiber Bragg Grating sensor response due to low speed impact on woven fiber composite plates was used to determine the extent of the impact damage. Three types of woven fabrics were considered in this study: plain, twill and 5 harness satin. A brief finite element analysis was used to determine the optimal location for the sensors. The bottom of the plate showed the highest strain response and was chose as the optimal location. The composite plates were fabricated and Fiber Bragg Grating sensors were mounted in the optimal location. The plates were subject to various impact energies using a modified Charpy impactor. The impact damage for each plate due to different impact energies was quantified through flash thermography and correlated with the FBG response. The flash thermography results showed excellent progression of damage in the plates and the sensor strain response was able to distinguish the impacts by considering both peak and plastic strain.

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Ruggles-Wrenn, M. B., and T. P. Jones. "Tension–Compression Fatigue of a SiC/SiC Ceramic Matrix Composite at Elevated Temperature." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68902.

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Tension-compression fatigue behavior of a non-oxide ceramic composite with a multilayered matrix was investigated at 1200°C in laboratory air. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated Hi-Nicalon™ fibers woven in an eight-harness-satin weave (8HSW). Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. Tension-compression fatigue behavior was studied for fatigue stresses ranging from 80 to 200 MPa at a frequency of 1.0 Hz. The R ratio (minimum stress to maximum stress) was −1.0. Fatigue run-out was defined as 2×105 cycles. Fatigue limit was 80 MPa. Specimens that achieved fatigue run-out were subjected to tensile tests to failure to characterize the retained tensile properties. The material retained 100% of its tensile strength. Reductions in tensile modulus and in compressive modulus were negligible. Composite microstructure, as well as damage and failure mechanisms were investigated.

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Ruggles-Wrenn, M. B., and M. T. Pope. "Creep in Interlaminar Shear of a SiC/SiC Ceramic Matrix Composite at Elevated Temperature." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26245.

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Creep behavior in interlaminar shear of a non-oxide ceramic composite with a multilayered matrix was investigated at 1200°C in laboratory air and in steam environment. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated Hi-Nicalon™ fibers woven in a five-harness-satin weave. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. The interlaminar shear properties were measured. The creep behavior was examined for interlaminar shear stresses in the 16–22 MPa range. Primary and secondary creep regimes were observed in all tests conducted in air and in steam. In air and in steam, creep run-out defined as 100 h at creep stress was achieved at 16 MPa. Larger creep strains were accumulated in steam. However, creep strain rates and creep lifetimes were only moderately affected by the presence of steam. The retained properties of all specimens that achieved run-out were characterized. Composite microstructure, as well as damage and failure mechanisms were investigated.

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Wilkinson, Michael P., and Marina B. Ruggles-Wrenn. "Mechanical Properties and Fatigue Behavior of 2D Woven PMC and Unitized Composite Airframe Structures at Elevated Temperature." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65763.

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Airframe structures and components on many existing and future Air Force aerospace systems require operation in elevated temperature. Examples include hypersonic vehicle airframes, engine related components (such as engine ducts, engine vanes, and exhaust flaps), and hot trailing edges of B-2 and C-17 wings. Material systems that show improved fatigue performance, excellent thermal resistance, and damage tolerance are prime candidate materials for potential air vehicle structural components. Polymer matrix composites (PMCs) and ceramic matrix composites (CMCs) are two types of composites used in aircraft structures subjected to high temperatures. The polymer matrix in most PMCs cannot withstand the temperatures required for many aerospace structural applications. Therefore, either improvements in temperature capability of polymer matrix materials or developing novel thermal protection systems are desired for elevated temperature applications. Any new material system intended for aerospace applications must be studied and tested to verify that the mechanical properties are sufficient for use in the operating environments. This study investigated the mechanical properties and tension-tension fatigue behavior of two newly developed material systems for use in structures subjected to elevated temperatures, namely a 2D weave PMC and a 2D weave unitized composite (or PMC/CMC, consisting of a PMC co-cured with a CMC layer to act as a thermal barrier). These two material systems are two of three new composites developed under contract through the Air Force Research Laboratory (AFRL) and investigated during a master’s thesis research program at the Air Force Institute of Technology (AFIT) [1]. The 2D PMC investigated in this effort consisted of an NRPE (a high-temperature polyimide) matrix reinforced with carbon fibers. The fiber architecture of the PMC was an 8 harness satin weave fiber fabric. The PMC portion of the unitized composite had the same constituent properties and weave as the aforementioned 2D PMC. The CMC layer consisted of a zirconia-based matrix reinforced with an 8 harness satin weave quartz fiber fabric. For both material systems (PMC and PMC/CMC), material properties were investigated for both on-axis [0°/90°] and off-axis [±45°] fiber orientations. Tensile properties were evaluated at (1) room temperature and (2) with one side of the specimen at 329 °C and the other side exposed to ambient air. Tension-tension fatigue tests were conducted at elevated temperature at a frequency of 1.0 Hz with a ratio of minimum stress to maximum stress of R = 0.05. Fatigue run-out for this effort was defined as 2×105 cycles. Elevated temperature had little effect on the tensile properties of both material systems with the 0°/90° fiber orientation; however, specimens with the ±45° fiber orientation exhibited a significant increase in failure strain at elevated temperature. The ultimate tensile strength (UTS) of the 2D PMC with the ±45° fiber orientation decreased slightly at elevated temperature, but the UTS of the unitized composite with ±45° fiber orientation showed no significant change. The unitized composite did not exhibit an increase in tensile strength and stiffness compared to the 2D PMC. However, the 2D PMC with ±45° fiber orientation produced significantly greater failure strain. The 2D PMC showed slightly better fatigue resistance than the unitized composite with the 0°/90° fiber orientation. For the ±45° fiber orientation, the fatigue limit for the 2D PMC was approximately two times greater than that for the unitized composite. Microstructural investigation of tested specimens revealed delamination in the 2D PMC and very severe delamination in the unitized composite.

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Tong, Michael, Vinod Nagpal, P. Murthy, and Subodh Mital. "Probabilistic modeling of high-temperature material properties of a 5-harness 0/90 Sylramic fiber/CVI-SiC/MI-SiC woven composite." In 39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2049.

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Schoeppner, G. A., and A. K. Roy. "Comparison of Elastic Properties for Unidirectional and Woven Laminates." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1179.

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Abstract An experimental program to examine the relationship between the material constants of laminates made of unidirectional pües and laminates made of woven fabric composites including plain weave (PW) and eight harness satin (8HS) weave has been conducted. All of the unidirectional and woven composite tension, compression and shear test coupons were fabricated with the same carbon fiber and toughened epoxy resin system. The test specimens were instrumented with back-to-back rosette strain gages and monitored throughout the test. The PW and 8HS woven fabric specimens were tested in both the warp and fill directions. The stress-strain curves of the woven fabric specimens reveal a knee (change in slope) at about 70 ksi, indicating the failure initiation process. The stress field of the weave geometry will be analyzed to understand the failure initiation process.

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Abdi, Frank, Saber DorMohammadi, Jalees Ahmad, Cody Godines, Gregory N. Morscher, Sung Choi, Rabih Mansour, and Steve Gonczy. "Optimizing Ceramic Matrix Composite Interlaminar Fracture Toughness (Mode I) Wedge Test." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58076.

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ASTM test standards for CMC’s Crack Growth Resistance (CGR) may exhibit a zig-zag (wavy) crack path pattern, and fiber bridging. The experimental parameters that may contribute to the difficulty can be summarized as: specimen width and thickness, interface coating thickness, mixed mode failure evolution, and interlaminar defects. Modes I crack growth resistances, GI were analytically determined at ambient temperature using wedge test, a modified double cantilever beam (DCB). Several Finite Element (FE) based Multi-scale modeling potential techniques were investigated: a) Multi-scale progressive failure analysis (MS-PFA); b) Virtual Crack Closure Technique (VCCT). Advantages and disadvantages of each were identified. The final modeling algorithm recommended was an integrated damage and fracture evolution methodology using combined MS-PFA and VCCT. The material tested in this study was a slurry-cast melt-infiltrated SiC/SiC composite with Tyranno ZMI fibers (Ube Industries, Kyoto, Japan) and a BN interphase. The fiber architecture consisted of eight plies of balanced 2-D woven five-harness satin. The total fiber volume fraction was about 30% with half of the fibers in the 0° direction and half in the 90° direction. All specimens had a nominal thickness of 4 mm. An alumina wedge with 18° head angle (2α) was used. In this method, a splitting force is created by inserting a vertically-moving wedge in a notch causing the arms to separate and forcing an interlaminar crack at the sharpest end of the notch The MS-PFA numerical model predicted the damage and fracture evolution and utilized the GENOA UMAT (User Material Subroutine) for Damage and FEM (Finite Element Model) stress intensity and LEFM (Linear elastic Fracture Model), Cohesive Model for Fracture. The analysis results (Fracture energy vs. crack length, Fracture energy vs. load, Fracture energy vs. crack opening displacement) matched the Mode I coupon tests and revealed the following key findings. Mode I-Wedge specimen exhibits: 1) failure mode is due to interlaminar tension (ILT) only in the interface section and a zig-zag pattern observed; 2) VCCT crack growth resistance is well matched to the test data; and 3) failure mode is a mixed mode behavior of Interlaminar tension (ILT) to interlaminar shear (ILS). The final Wedge test specimen configuration optimization includes the sensitivity of design parameters to CGR: a) wedge contact coefficient of friction; b) lever arms thickness, and c) inclined head angle, distance between the initial crack and wedge tip.

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Yu, Z. Zack, Ridvan Amir Sahan, and X. Howard Sun. "Thermal Simulation for Outdoor Optical Network Unit." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35348.

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An Optical Network Unit (ONU) used in Fiber-to-the-Curb (FTTC) system is one of the last mile equipment in telecommunications industry. The ONU usually operates in an outdoor environment like many other telecommunications cabinets. The ONU, in this study, is placed inside a CAT12 pedestal. The pedestal provides the housing for the termination block, the cable harness, the gas tube protection, etc. besides the ONU. Due to the proximity to residential areas and the reliability requirement for the operation, most of ONUs uses the passive cooling instead of the active cooling. It is very critical to ensure that all electronics including the optics operate within their thermal specifications. From the thermal perspective, most of the outdoor equipment for telecommunications industry follows the guidelines of GR-487-CORE, Issue 2. The CFD model analysis as well as engineering mockup tests provide the effective tools to meet the thermal requirements in this study. With the baseline model working, it is found that it would be very efficient to predict the thermal trends in different design conditions performing CFD simulations using readily available analysis tool Icepak.

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