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Fatigue Initiation on Type 316LR Straight Bone Plate 316LR型直骨板的疲劳萌生
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c0048407
{"title":"Fatigue Initiation on Type 316LR Straight Bone Plate","authors":"","doi":"10.31399/asm.fach.med.c0048407","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c0048407","url":null,"abstract":"\u0000 The plate used to treat a pseudarthrosis in the proximal femur was investigated for reasons of non-progress of healing. Fatigue cracks were revealed on the top surface of the small section of the plate at the fifth screw hole. The plate was found to be heavily loaded by comparison of intensity of these structures, compared to results of systematic crack-initiation experiments. It was revealed by fatigue bending tests that the fatigue life of plates with asymmetrically arranged holes is at least as long as for plates with holes situated in the center. Fatigue began at the large section only after a fatigue crack begins to propagate into the small plate section. A large secondary crack which had developed parallel to the main crack in the center of the surface was revealed. The fifth hole was situated at the transition between the supporting bone and the defect and hence stress concentration was revealed to be high.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127523412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fracture of a Bone Drill 骨钻骨折
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c9001187
F. Naumann, F. Spies
{"title":"Fracture of a Bone Drill","authors":"F. Naumann, F. Spies","doi":"10.31399/asm.fach.med.c9001187","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c9001187","url":null,"abstract":"\u0000 A stainless tool steel bone drill broke during an operation on a patient and was examined. It showed two fatigue fractures, one of which had started from a sharp-edged, coarsely milled slot (fracture A1), and the other from a point on the outer sheath surface which was not subjected to particularly high stresses (fracture A2). Fatigue fracture A1 resulted from the stress concentration built up at this point as a result of the sharp edges and the coarse machining grooves. The remains of a number, which had been inscribed with an electrical engraving tool for identification purposes, were found at the point of origin of fracture A2. The material had been heated to the melting point during the engraving of the number, and multiple cracking occurred during cooling. One of these cracks led to the development of fatigue fracture A2.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123539518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Broken Stem of Femoral Head Component of Total Hip Prosthesis Made From Cast Cobalt-Base Alloy 铸造钴基合金全髋关节假体股骨头假体断梗
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c0048423
{"title":"Broken Stem of Femoral Head Component of Total Hip Prosthesis Made From Cast Cobalt-Base Alloy","authors":"","doi":"10.31399/asm.fach.med.c0048423","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c0048423","url":null,"abstract":"\u0000 The bone cement failed at the distal end of the prosthesis stem of femoral head prosthesis six months after implantation. A small indentation on the lateral contour of the stem was visible where the stem had broken. The degree of loosening (gap between the lateral stem contour and the bone or cement) and implant loading was revealed by the dislocation of fragments of the prosthesis. Secondary cracks that had originated at the lateral aspect of the stem were revealed by metallographic examination of a section parallel to the stem surface and perpendicular to the fracture surface of the distal fragment. Gas pores are apparent in the grain and at the grain boundaries were revealed by a transverse section. Fine parallel line structures that run diagonally through the fractograph may be slip traces were revealed by scanning electron microscopy. One of the cracks was revealed to have propagated through a larger gas pore by a ruptured gas pore. The stresses created through the fatigue process activated glide systems which served the formation of secondary cracks along glide planes.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116737783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Intercrystalline Corrosion on Cerclage Wire of Sensitized 304 Type Stainless Steel 304型不锈钢敏化环扎丝的晶间腐蚀
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c0048400
{"title":"Intercrystalline Corrosion on Cerclage Wire of Sensitized 304 Type Stainless Steel","authors":"","doi":"10.31399/asm.fach.med.c0048400","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c0048400","url":null,"abstract":"\u0000 Cerclage wire, which was used with two screws and washers for a tension band in a corrective internal fixation, was found broken at several points and corroded after nine months in service. The material was examined using energy-dispersive x-ray analysis and determined not to be in compliance with standards (type 304 stainless steel without molybdenum). The screws and washers were found to be made of remelted implant-quality type 316L stainless steel and were intact. Signs of sensitization, characterized by chromium carbide precipitates at the grain boundaries, were revealed by the microstructure. Intercrystalline corrosion with pitted grains was indicated by SEM fractography. Improper heat treatment of the steel was interpreted to have led to intercrystalline corrosion and implant separation.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122366429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pitting of TiN-Coated Back Surgery Wires 镀锡背部手术丝的点蚀
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c9001573
Suranjeeta Dhar, Fameeda Mohammed, Laura Xu, R. Fontana
{"title":"Pitting of TiN-Coated Back Surgery Wires","authors":"Suranjeeta Dhar, Fameeda Mohammed, Laura Xu, R. Fontana","doi":"10.31399/asm.fach.med.c9001573","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c9001573","url":null,"abstract":"\u0000 TiN coated back surgery wires were made of Ti-6Al-4V. The reported failure was the presence of pits located in the uncoated area of the wires. The uncoated area of the wire is where the wire is fixtured in the coating chamber during coating. Examination and analysis of the pits using SEM/EDX detection unit revealed significant peaks of B, O, Zr and Fe. Moreover, the shape of the pits was similar to an arc crater. The formation of pits in the wire was caused during coating due to microarcing. A contaminated fixture used during the coating most likely caused the microarcing.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117253509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects 铸造缺陷的Co-Cr-Mo合金复位骨螺钉
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c0089543
{"title":"Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects","authors":"","doi":"10.31399/asm.fach.med.c0089543","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c0089543","url":null,"abstract":"\u0000 Threads of a bone screw (Co-Cr-Mo alloy, type ASTM F75) had broken off, and other threads had cracked. 15x sectioning showed porosity, and 155x magnification showed gas holes, segregation, and dissolved oxides. This supports the conclusion that manufacturing defects caused the failure.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127002096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metallurgical Failure Analysis of a Broken Compression Hip Screw Surgical Implant 髋部加压螺钉手术植入物断裂的冶金失效分析
ASM Failure Analysis Case Histories: Medical and Biomedical Devices Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.med.c9001664
C. R. Brooks, A. Choudhury
{"title":"Metallurgical Failure Analysis of a Broken Compression Hip Screw Surgical Implant","authors":"C. R. Brooks, A. Choudhury","doi":"10.31399/asm.fach.med.c9001664","DOIUrl":"https://doi.org/10.31399/asm.fach.med.c9001664","url":null,"abstract":"\u0000 A compression hip screw is a device designed to hold fractures in the area of the femur in alignment and under compression. A side plate, which is an integral part of the device, is attached by screws to the femur, and it holds the compression screw in position. The device analyzed had broken across the eighth hole (of nine holes) from the end of the plate. The detailed metallurgical failure analysis of the device, including metallography and fractography, is reported here. It was found that the device had adequate metallurgical integrity for the application for which it was intended. It is believed that failure was caused by the lack of a screw in the ninth hole. Evidence is also presented which indicates that the device was bent prior to insertion, and the local plastic deformation may have caused structural changes leading to premature crack initiation.","PeriodicalId":125471,"journal":{"name":"ASM Failure Analysis Case Histories: Medical and Biomedical Devices","volume":"99 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128011749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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