Relevant bibliographies by topics / Opening-wedge

Academic literature on the topic 'Opening-wedge'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Opening-wedge"

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Oh, Seung Min, Kyung Wook Nha, and Jae Hwi Han. "Opening Wedge High Tibia Osteotomy." Journal of the Korean Orthopaedic Association 53, no. 4 (2018): 293. http://dx.doi.org/10.4055/jkoa.2018.53.4.293.

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Puddu, Giancarlo, and Vittorio Franco. "Femoral antivalgus opening wedge osteotomy." Operative Techniques in Sports Medicine 8, no. 1 (January 2000): 56–60. http://dx.doi.org/10.1016/s1060-1872(00)80026-x.

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Noyes, Frank R., William Mayfield, Sue D. Barber-Westin, Jay C. Albright, and Timothy P. Heckmann. "Opening Wedge High Tibial Osteotomy." American Journal of Sports Medicine 34, no. 8 (August 2006): 1262–73. http://dx.doi.org/10.1177/0363546505286144.

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O'Malley, Michael, Patrick J. Reardon, Ayoosh Pareek, Aaron Krych, and Michael J. Stuart. "Opening-Wedge Proximal Tibial Osteotomy." Arthroscopy Techniques 5, no. 4 (August 2016): e769-e774. http://dx.doi.org/10.1016/j.eats.2016.03.005.

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Zehir, Sinan, Murat Çalbıyık, Ercan Şahin, Mahmut Kalem, Murat Songür, and Deniz İpek. "Opening Wedge High Tibial Osteotomy Using Tricalcium Phosphate Wedge." Orthopaedic Journal of Sports Medicine 2, no. 11_suppl3 (November 1, 2014): 2325967114S0013. http://dx.doi.org/10.1177/2325967114s00137.

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Objectives: High tibial osteotomy is a standard procedure indicated for early medial sided osteoarthritis in varus knees. In this study, we present the early results of high tibial open wedge osteotomy cases using beta-tricalcium phosphate as a graft substitute and Otis-c plate. Methods: Between years 2010 and 2013, 47 cases of (34F, 13 M) medial compartmental gonarthrosis with genu varum deformity treated with high tibial osteotomy, were evaluated with at least one year follow-up, preoperatively both clinically and radiologically. Clinical evaluation involved functional assessment and pain evaluation using Lysholm and visual analog scale (VAS) scores, including knee range-of-motion. Radiological evaluation included medial joint space measurements on weight bearing knee radiographs with measurements of varus angle and posterior tibial slope. Surgical procedure included standard arthroscopy followed by medial sided opening wedge osteotomy with correction of the varus deformity using β- tricalcium phosphate graft substitute and fixation of the osteotomy site using Otis-C plate and locking screws. All patients were evaluated at the end of minimum one-year follow-up period. Results: Mean age of the patients was 56,7 (50- 65) years and mean follow-up period was 24,5 (12- 44) months. Mean duration of surgery was 47,4±10.2 minutes. No case of nonunion, delayed union, neurovascular injury or iatrogenic fracture was encountered. Two cases developed deep vein thrombosis and one case developed superficial wound infection managed successfully by local debridement with retention of implants and antibiotics. Mean duration of union was 13,4±2.7 weeks. Mean preoperative and follow-up range-of-motion were measured as 131±8.9 and 129±9.1 respectively with no statistical difference. Preoperative and follow-up VAS scores showed significant difference as 7.6±1.76 and 2.3±1.08 respectively (p=0.001). Also Lysholm scores improved significantly at the end of the follow-up period (43.23±4.01 vs. 76.3±3.7 p<0,001). Radiological evaluation revealed mean correction angle of 10.84±2.70 degrees at follow-up. Mean posterior tibial slope was measured relatively unchanged (8.6±1.70° degrees preoperatively versus 8.2±2.30° follow-up). Medial joint space width measurements showed a significant increase (pre-op 3.7±1.6 mm. versus 4.6±1.32 mm. at the follow-up (p<0.001)). Conclusion: Medial opening wedge osteotomy for treatment of early medial compartment gonarthrosis in varus knees is still a valuable option. Our short term preliminary results using beta-tricalcium phosphate wedge graft substitute and Otis-c plate-screw osteosynthesis revealed satisfactory short term clinical and radiological results with acceptable complication rates.
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Koshino, Tomihisa. "Opening Wedge High Tibial Osteotomy Using a Bioceramic Wedge." Techniques in Knee Surgery 3, no. 4 (December 2004): 206–14. http://dx.doi.org/10.1097/00132588-200412000-00002.

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Cho, Se Hyun, Sun Chul Hwang, Kang Min Sohn, and Hyung Kan Kim. "Comparison of Closing-Wedge and Opening-Wedge High Tibial Osteotomies." Journal of the Korean Orthopaedic Association 47, no. 2 (2012): 104. http://dx.doi.org/10.4055/jkoa.2012.47.2.104.

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Esenkaya, Irfan. "Opening Wedge Proximal Tibial Osteotomy Using the Plate With Wedge." Techniques in Knee Surgery 5, no. 4 (December 2006): 261–73. http://dx.doi.org/10.1097/01.btk.0000234080.71269.b6.

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Sarabia-Condes, J. M., S. Villaescusa-Marín, C. Hernández-García, and M. A. Martín-Ferrero. "Opening-wedge High Tibial Osteotomy with a Tricalcium Phosphate Wedge." Revista Española de Cirugía Ortopédica y Traumatología (English Edition) 51, no. 4 (July 2007): 182–87. http://dx.doi.org/10.1016/s1988-8856(07)70032-9.

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Al-Saati, Maʼad F., Robert A. Magnussen, Guillaume Demey, Sebastien Lustig, Elvire Servien, and Philippe Neyret. "Lateral Opening-wedge High Tibial Osteotomy." Techniques in Knee Surgery 10, no. 3 (September 2011): 178–85. http://dx.doi.org/10.1097/btk.0b013e31822bac0f.

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Dissertations / Theses on the topic "Opening-wedge"

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Black, Marianne Susan. "The effect of wedge and slope angles on knee contact pressure and kinematics in medial opening wedge high tibial osteotomy." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50103.

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Mountain, Maria L. "The effect of three weeks aquatic therapy on range of motion and pain following an opening wedge high tibial osteotomy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0006/MQ42086.pdf.

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Navrátil, Petr. "Modelování odezvy zkušebních těles ze stavebních materiálů při lomových experimentech." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225725.

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The thesis focuses on the computational simulation of wedge splitting test of a concrete specimen by using finite element method. Different levels of numeric model for different notch depth and for different position of support are solved. Depending on the depth of a notch and difference of configuration, the crack paths and responses to an exterior load on a crack mouth opening displacement are evaluated.
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Donnez, Mathias. "Planification préopératoire pour ostéotomies autour du genou : d’un modèle numérique tridimensionnel à l’industrialisation de guides patient-spécifique." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0474.

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L’Ostéotomie Tibiale de Valgisation (OTV) par ouverture médiale est un traitement conservatif efficace dans le traitement de la gonarthrose médiale chez le patient jeune et actif présentant un défaut d’alignement du membre inférieur. Ce défaut entraine un déséquilibre dans la répartition des charges transitant dans le genou et est un facteur de risque la gonarthrose. L’objectif est de corriger l’alignement en corrigeant une déformation osseuse du tibia proximal. Une coupe osseuse médiolatérale incomplète partant du bord médial de la métaphyse tibiale et orientée vers l’articulation tibio-fibulaire permet de créer une ouverture sur le bord médial par rotation autour de la charnière latérale, épaisseur d’os non-coupée sur le bord latéral. L’importance de l’ouverture dépend de la déformation osseuse et du stade d’arthrose. La réussite de l’OTV par ouverture médiale est conditionnée par une correction précise, un montage d’ostéosynthèse stable et une charnière latérale préservée pendant l’ouverture. L’objectif de cette thèse était de proposer une méthodologie de planification préopératoire à associer à une instrumentation patient-spécifique réalisée en impression 3D. Cette instrumentation devait permettre d’appliquer la correction souhaitée dans les plans frontal et sagittal mais aussi de préserver la charnière latérale pendant la chirurgie. Nos résultats ont montré, grâce aux études in-vitro et in-vivo réalisées au cours de la thèse, que le guide de coupe patient-spécifique développé permet de reproduire avec précision la planification préopératoire en apportant de la sécurité au geste opératoire tant au niveau de la précision que de la préservation de la charnière latérale
Medial Opening Wedge High Tibial Osteotomy (MOWHTO) is an efficient conservative surgical treatment for young and active patients with moderate medial gonarthrosis and varus lower limb malalignment. Varus malalignment unbalances load distribution in the knee, which is a gonarthrosis risk factor. MOWHTO aims to correct the lower limb alignment by correcting the proximal tibia bony deformity. Incomplete mediolateral cut is performed in the proximal tibia from the medial side of the tibial metaphysis towards the tibiofibular joint, and then opened by rotation around the lateral hinge which is the remaining uncut bone thickness on the lateral side. Amount of the opening depends on the importance of the proximal tibial deformity and on the medial gonarthrosis stage. MOWHTO success remains on precise correction, stable osteosynthesis system and lateral hinge preservation during the opening. Objective of this thesis was to propose a preoperative planning methodology to be associated with 3D printed patientspecific instrumentation. This instrumentation was intended to apply the correction chosen by the surgeon in the frontal and sagittal planes, but also to preserve the lateral hinge during the surgery. Our in-vitro and in-vivo results have shown that the developed patient-specific cutting guide make it possible to accurately reproduce the preoperative planning with security to the surgical gesture by bringing accuracy and lateral hinge preservation
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Chang, Kao-Wha, and 張國華. "Closing-opening wedge osteotomy for the treatment of sagittal imbalance or kyphotic deformity." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69647666057616395437.

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博士
國立中興大學
生物產業機電工程學系所
98
Kyphotic deformity can produce sagittal malalignment and imbalance. Patients can not move or stand erect without overwork of musculature because of compromising the biomechanical advantage. The result is muscle fatigue and activity-related pain. During reconstructive surgery, restoration of the best possible sagittal balance is crucial for obtaining satisfactory clinical results. However, there are two problems for this. The first, there is no way to control and predict the quality or outcomes of the reconstructed sagittal balance before or during operation. The second, there is no an osteotomy through posterior-only approach for the large and rigid kyphosis to allow three-column release and large range of correction. A method was developed to determine the lumbosacral curve which theoretically would bring spinal sagittal balance to an ideal state by calculation and simulation for each patient preoperatively and a template and blueprint was made accordingly for operative procedures to follow. Also a new osteotomy, closing-opening wedge osteotomy(COWO), to provide three-column release through a posterior-only approach was developed and could make rigid kyphotic deformity flexible enough to be adequately manipulated to match the template and to obtain optimal correction of sagittal imbalance. The objective of this study is to investigate the feasibility of controlling quality of reconstructed sagittal balance for sagittal imbalance and to evaluate the safety and efficacy of the new method and surgical procedures to reconstruct an optimal sagittal balance for patients with sagittal imbalance or kyphotic deformity. The report contained two studies. In study 1, thirty-one patients with degenerative lumbar kyphoscoliosis (mean age, 72.3 years; range, 65–78 years) treated with the method and COWO were followed up for a mean of 4.1 years. Their preoperative, 2-month postoperative, and final follow-up radiographs were assessed and a questionnaire to measure changes in pain, function, self-image, patient satisfaction with surgery administered was. Postoperative complications was analyzed. In study 2, eighty-three consecutive patients treated for sagittal imbalance with the method and COWO with a minimum follow-up of two years were analyzed. Radiographic analysis included assessment of thoracic kyphosis, lumbar lordosis, lordosis through COWO site, and sagittal balance. Outcomes analysis utilized the Scoliosis Research Society questionnaire. Complications and radiographic findings were analyzed. In study 1, final radiographs showed increased L1–S1 lordosis from 11.3° to -50.5° (increase of 61.8°), correction of kyphotic deformity from 64.3° to -14.1°, and correction of scoliotic deformity from 48.9° to 8.3°. Sagittal imbalance significantly improved from 68.8 to 27.1 mm, whereas the sacrofemoral distance decreased from 59.3 to -5.1 mm, and the sacral inclination angle increased from 9.7° to 34.3°. Subjective pain was significantly and persistently reduced. Most patients maintained good correction and had good clinical results. No major complication occurred. Eight patients (26%) developed junctional kyphosis. In study 2, the average increased in lordosis and improved sagittal balance were 81.9o and 17.1 cm. Mean correction through the osteotomy site was 42.2o (range 31-55o). No vascular injury occurred. While three patients developed lumbosacral pseudarthrosis, the COWO area was unaffected in all patients. Nine patients developed cephalad junctional kyphosis and two patients developed caudad junctional kyphosis. Most patients reported improvement in terms of pain, self-image, and function as well as overall satisfaction with the procedure. Analysis of all radiographic datas showed the mean estimated values of L1-S1 lordosis, sacral inclination angle (SIA), sacrofemoral distance (SFD), and distribution of L1-S1 lordosis at the closing-opening wedge osteotomy (COWO) site and L4-S1 segments were -30.8o, 24.6o, 0 mm, 16.1% (-5o), and 62% (-19o), respectively. The mean reconstructed values were -41.1o, 23.3o, 3.9 mm, 41% (-17o), and 46% (-19o), respectively. There were significant differences between estimated and reconstructed values of L1-S1 lordosis and percent of distributions, however, there was no significant difference between the estimated and reconstructed magnitude of L4-S1 lordosis, SIA, and SFD. A properly oriented pelvis can be brought nearly directly above the hip axis. The mean sagittal global balance, represented by the distance between the vertical line through the hip axis and sacral promontory, improved from 61.4 mm before surgery to 3.9 mm 2 months after surgery. Normal sagittal global balance was reconstructed. The mean sagittal spinal balance measured as the horizontal distance between the C7 sagittal plumb line and the posterior superior corner of S1 improved from 97.4 mm before surgery to 11 mm 2 months after surgery. Normal sagittal spinal balance was reconstructed. Quality control of the reconstructed sagittal balance for sagittal imbalance is possible. Correctly orienting the pelvis reconstructed by restoration of enough L1-S1 lordosis with adequate distribution at L4-S1 segments is a matter of critical importance for optimizing reconstructed sagittal balance. Preventing junctional fracture and persistent rehabilitation of surgically injured lumbar extensor musculature are crucial for maintaining the reconstructed sagittal balance. COWO is a safe and useful procedure for patients with sagittal imbalance the level of patient satisfaction was high after more than two years of follow-up, with most patients having improved resolution of pain, increased self-image, and greater function. A worse clinical result is associated with increasing patient comorbidities, pseudarthrosis in lumbosacral fusion, and junctional kyphosis.
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Books on the topic "Opening-wedge"

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Leck, Ralph M. Motifs in Sexual Science. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252040009.003.0001.

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This chapter places Ulrichs' scholarship within the larger constellation of sexual science. The major motifs discussed here include: the methodology of the case study, debates as to whether sexual research should become public knowledge or remain sequestered among experts, the civic meaning of discourses of nature, Ulrichs' influence on British sexologists, and an explanation of how the story of sexual science is altered by a narrative that commences with and centers around Ulrichs' legacy. The chapter shows how examinations of Ulrichs' political and scientific innovations are a wedge opening new insights into the history of sexual science, legal systems, and Western amatory codes.
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Book chapters on the topic "Opening-wedge"

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Jeszenszky, Dezső, Michael Ruf, Markus Loibl, and Tamás Fülöp Fekete. "Spinal Opening Wedge Osteotomy." In The Growing Spine, 525–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-84393-9_33.

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Lustig, S., Maad F. AlSaati, and Robert A. Magnussen. "Lateral Opening Wedge Tibial Osteotomy." In Surgery of the Knee, 181–88. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-5631-4_20.

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Saghieh, Said. "Medial Opening Wedge Tibial Osteotomy." In Operative Dictations in Orthopedic Surgery, 149–51. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7479-1_40.

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Cerciello, S., K. Corona, and P. Neyret. "Lateral Opening-Wedge Distal Femoral Osteotomy." In Osteotomy About the Knee, 149–60. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49055-3_10.

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Basilico, Mattia, Tomas Pineda, Elliot Sappey-Marinier, and Sebastien Lustig. "Lateral Opening-Wedge High Tibial Osteotomy." In Osteotomy About the Knee, 173–85. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49055-3_12.

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Ahmad, Sufian S. "Medial Opening Wedge High Tibial Osteotomy." In ESSKA Instructional Course Lecture Book, 27–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61264-4_4.

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Petersen, Tore T. "Egypt: Opening Wedge to the Middle East." In The Middle East between the Great Powers, 1–18. London: Palgrave Macmillan UK, 2000. http://dx.doi.org/10.1057/9780230599093_1.

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DeCarbo, William T., and Mark J. Bullock. "Basilar Opening and Closing Wedge Osteotomy Procedures." In Evidence-Based Bunion Surgery, 137–49. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60315-5_10.

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Parkar, Asif, Philip Pastides, Raghbir S. Khakha, and Matt Dawson. "Void Filler in Opening Wedge Osteotomies Around the Knee." In ESSKA Instructional Course Lecture Book, 91–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61264-4_13.

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Calder, Stuart J., Fragkiskos N. Xypnitos, and Peter V. Giannoudis. "Corrective Osteotomies About the Knee: Opening Wedge High Tibial Osteotomy." In Practical Procedures in Elective Orthopaedic Surgery, 237–45. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-814-0_29.

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Conference papers on the topic "Opening-wedge"

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Zhang, Yiwen, Si-Ao Li, Xiaoyan Wang, Haoyuan Xu, Jinyao Wang, Yan-Ge Liu, Weigang Zhang, et al. "Wedge Angle and Direction Detection of Multi-opening Object Using Deep Learning." In Imaging Systems and Applications. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/isa.2022.itu5e.2.

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CNN is used to identify the number of openings, wedge angle and direction of multi-opening object with probing Gaussian beam. 97.37% accuracy is achieved for different classifications with 1° precision and up to 36 openings.
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Scheer, Justin K., Jessica A. Tang, Vedat Deviren, Jenni M. Buckley, Murat Pekmezci, R. Trigg McClellan, and Christopher P. Ames. "Biomechanical Analysis of Cervicothoracic Junction Osteototomy in Cadaveric Model of Ankylosing Spondylitis: Effect of Rod Material and Diameter." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19130.

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Ankylosing spondylitis is a genetic condition [1] that frequently results in spinal sagittal plane deformity of thoracolumbar or cervicothoracic junction. Generally, a combination of osteotomy and spinal fixation is used to treat severe cases of ankylosing spondylitis to restore spinal balance and horizontal gaze [2]. This study investigates the biomechanics of opening wedge osteotomy at the cervicothoracic junction. Although surgical techniques for traumatic injury across the cervicothoracic junction have been well characterized in the clinical and biomechanical literature, the specific model of instrumented opening wedge ostetomy in autofused ankylosing spondylitis has not been studied biomechanically.
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Scheer, Justin K., Jessica A. Tang, Vedat Deviren, Jenni M. Buckley, Murat Pekmezci, R. Trigg McClellan, and Christopher P. Ames. "Biomechanical Analysis of Osteotomy Type (OWO, CWO) and Rod Diameter for Treatment of Cervicothoracic Kyphosis." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19128.

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Sagittal imbalance of the cervicothoracic spine often causes severe pain and loss of horizontal gaze. Traditionally, C7 opening wedge osteotomy has been classically performed for patients with ankylosing spondylitis. For patients without ankylosing spondylitis closing wedge osteotomy may be considered for more controlled closure. Biomechanical characteristics of the two osteotomy alternatives have not yet been analyzed. The goal of this study is to characterize the structural stability of the two types of cervicothoracic junction osteotomies and the independent effect of rod diameter.
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Cao, Meigen, Mu Fan, and Hequn Min. "The Interaction Problem Between a Crack and a Wedge Disclination Dipole With Irwin Plastic Zone Correction." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10852.

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Abstract In this work, the multiple defects interaction problem is studied. A crack located near an inclusion is influenced by a wedge disclination dipole. Stress field induced by the disclination affects the crack tip field and yield behavior of the crack. With varying the wedge disclination dipole properties, including strength, position to the crack tip, arm length, etc., the plastic zone size (PZS), the crack tip opening displacement (CTOD) and the stress intensity factor (SIF) are estimated with the generalized Irwin model. Numerical results showed that the wedge disclination dipole arm length and strength can significantly increase or decrease the values of the CTOD and PZS, depending the disclination dipole positions. The maximum values of the CTOD and the PZS were explored with the change of disclination position.
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Sano, Hayato, Koji Takahashi, and Kotoji Ando. "Prevention of Stress Corrosion Cracking of SUS304 by Tensile Overload." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25573.

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The effects of overload on the threshold stress intensity factor (KISCC) for stress corrosion cracks (SCC) in stainless steel were studied. Tensile overload was applied to a wedge opening loaded specimen of SUS304, and SCC tests were carried out to determine the resultant KISCC. The value of KISCC was found to increase with increasing stress intensity caused by tensile overload. Comparison of the effects of tensile overload on KISCC of SUS304 and SUS316 revealed that the effect on KISCC of SUS304 was smaller than that of SUS316.
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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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Takahashi, Koji, Yuji Miyazaki, Yasuaki Hashikura, and Kotoji Ando. "Improvement of the Threshold Stress Intensity Factor for Stress Corrosion Cracking in SUS316 by Tensile Overload." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25610.

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The effects of overload on the threshold stress intensity factor (KISCC) for stress corrosion cracks (SCC) in stainless steel were studied. Tensile overload was applied to a wedge opening loaded specimen of SUS316, and SCC tests were carried out to determine the resultant KISCC. As a result, the value of KISCC was found to increase with increasing stress intensity factor by tensile overload. The effects of tensile overload on KISCC and the threshold stress intensity factor range for fatigue (ΔKth) were compared. It was found that the effect of tensile overload on KISCC was larger than that of ΔKth.
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8

Keim, Elisabeth, Reinhard Langer, Hilmar Schnabel, and Reinhard Bartsch. "Warm Pre-Stress Effect Measured at Irradiated RPV Weld Material." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71196.

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The recently initiated German project CARISMA (Crack Initiation and Arrest of Irradiated Steel Materials) will create a data base on pre-irradiated original materials of the four generations of German nuclear pressurized water reactors, which allows the examination of the consequences if the Master Curve instead of the RTNDT concept is applied. Several original materials of the four generations of German nuclear power plants (typical for KWO, KKS - Biblis A, Biblis B, KKU - KKG, KWG, KKP2, KBR - KKE, KK12, GKN2) will be investigated. They have been irradiated in six large scale irradiation capsules in a German research reactor (the VAK plant) at corresponding plant conditions. The capsules contain regular tensile and Charpy impact specimens as well as Pellini and fracture toughness wedge opening load specimens up to a specimen thickness of 100 mm. The first fracture toughness tests have been performed on a weld metal NiCrMo1 UP(mod.)/LW320, LW340 (1. generation, lower bound of the weld materials)—with a fluence Φ = 2,12E19 cm−2 (E &gt; 1 MeV). This weld has a Cu-content of 0.22 wgt.% and it was therefore supposed to show a large transition temperature shift. Some fracture toughness tests in the irradiated material condition were already available and during this project four 100 mm thick wedge opening load (WOL) specimens were tested. At one of the specimens brittle failure could not be achieved during the test, because the load capacity of the test machine was exceeded. Therefore the specimen was loaded by a load-unload-cool-fracture load path to demonstrate the warm pre-stress effect of this highly irradiated specimen. At the final fracture of the specimen at a lower temperature, the failure load was significantly higher than the original one (factor 3 higher), which clearly indicates that the benefit of warm pre-stressing will not be eroded with irradiation.
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9

Sindelar, Robert L., Joe T. Carter, Andrew J. Duncan, Brenda L. Garcia-Diaz, Poh-Sang Lam, and Bruce J. Wiersma. "Chloride-Induced Stress Corrosion Crack Growth Under Dry Salt Conditions: Application to Evaluate Growth Rates in Multipurpose Canisters." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63884.

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The conditions of continued dry storage of the spent nuclear fuel in multipurpose canisters render the canisters, a component for confinement in dry storage cask systems, susceptible to chloride-induced stress corrosion cracking (SCC). The requisite conditions involve deposits of chloride-bearing marine salts and/or dust that deliquesce on the external surface of the cooling canister to create brine at weld residual stress regions. The subcritical crack growth rate at this “dry salt” condition, investigated by several researchers, has shown a relatively slow growth rate compared to chloride-cracking under aqueous conditions. A new SCC growth rate test specimen configuration has been developed to enable an initially dried salt assemblage to deliquesce under temperature and humidity conditions to load the fatigue pre-cracked, wedge-opening-loaded (WOL) specimen with the brine and enable measurements of crack growth rate (da/dt) under falling stress intensity factor, KJ, conditions. The application of the results to a canister weldment with a residual stress profile to predict crack extension in time is described. The results are evaluated in terms of development of acceptance standards for this type of flaw, should SCC be identified and characterized through inservice inspection (ISI).
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10

Yoshimoto, Kentaro, Takatoshi Hirota, and Hiroyuki Sakamoto. "Applicability of Fracture Toughness Curves Developed for Japanese Pressure Vessel Steels to Structural Integrity Evaluation." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45275.

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Surveillance tests have been conducted on Japanese Pressurized Water Reactor (PWR) plants for more than 40 years to monitor irradiation embrittlement of reactor pressure vessel (RPV) beltline materials. Fracture toughness specimens are contained as well as tensile and Charpy impact specimens in a surveillance capsule and utilized for structural integrity evaluation. Therefore, a lot of fracture toughness data have been obtained by fracture toughness tests using such as Compact Tension (CT) and Wedge Opening Loading (WOL) specimens. More than one thousand data have been accumulated for both unirradiated and irradiated materials until 2013. Additionally, in terms of fracture toughness, Master Curve (MC) concept has been widely used for fracture toughness transition curve expression of ferritic steels. Considering such a situation, the new fracture toughness curves using Tr30, which denotes Charpy V-notch 30ft-lb transition temperature, as an indexing parameter were developed based on MC concept depending on product form for Japanese RPV steels in 2014. In this study, applicability of the newly developed curves of Japanese RPV steels to structural integrity evaluation is investigated. Especially, this paper focused on conservatism of the curves and the adequate margin to be added in evaluation of RPV integrity employing statistical methodology.
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