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首页> 外文期刊>Engineering failure analysis >Premature fracture of a stainless steel 316L orthopaedic plate implant by alternative episodes of fatigue and cleavage decoherence
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Premature fracture of a stainless steel 316L orthopaedic plate implant by alternative episodes of fatigue and cleavage decoherence

机译：316L不锈钢矫形板植入物过早断裂，疲劳和劈裂退相干交替发生

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摘要

An orthopaedic SS 316L compression plate implant (dimensions 220 x 15 x 6 mm) with suitably prepared holes was mounted by means of 12 screws after a surgical operation to the left femur bone of a 72 years old patient. Six months after the surgical operation the implant failed by fracture at a central point across its length requiring a second surgery for the i replacement of the device. Compression plate implants, when improperly installed, may fail by means of a fatigue mechanism if they are subjected to cyclic loading. This occurs within a short period of time and is followed by a catastrophic final step. This mechanism is manifested by striations on the failed surfaces under scanning electron microscopy. In the present study, the fracture topography of the mating surfaces show a mixed fracture morphology created by alternative episodes of fatigue and cleavage decoherence without any evidence of corrosion assistance. This low energy fracture behaviour was largely due to post operational malpractice, which subjected the implant in cyclic loading during the patient's walking motion just a few days after the surgery.
机译：外科手术后，使用12颗螺钉将具有适当准备好的孔的矫形SS 316L加压钢板植入物（尺寸220 x 15 x 6 mm）安装到72岁患者的左股骨上。外科手术六个月后，植入物在其整个长度的中心点因断裂而破裂，需要第二次手术以更换该装置。如果压板植入物安装不当，如果承受周期性载荷，则可能会由于疲劳机制而失效。这是在很短的时间内发生的，然后是灾难性的最后一步。该机制通过在扫描电子显微镜下在失效表面上的条纹显示出来。在本研究中，配合面的断裂形貌显示出混合的断裂形态，这是由疲劳和劈裂退相干的交替发作所产生的，而没有任何腐蚀辅助的迹象。这种低能量的骨折行为在很大程度上是由于手术后的不当行为，在手术后几天，患者的步行运动使植入物承受周期性的负荷。

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