VALUE OF COINING ON THE IMPROVEMENT OF ENDURANCE IN SLOTTED INTRAMEDULLARY NAILS
VALUE OF COINING ON THE IMPROVEMENT OF ENDURANCE IN SLOTTED INTRAMEDULLARY NAILS
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DOI：
10.1016/0141-5425(91)90110-s
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发表时间：
1991-07-01
期刊：
影响因子：
--
通讯作者：
PERREN, SM
中科院分区：
文献类型：
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作者：
GASSER, B;RUSSENBERGER, ME;PERREN, SM
已观察到髓内钉的开裂，从部分狭缝的近端开始并沿周向传播。这些局部裂纹是相对频繁的，虽然完全失效是非常罕见的，并不妨碍骨折愈合。压印是一种冷加工工艺，用于提高塑性变形产生残余压应力的结构的耐久性。研究了压紧对疲劳裂纹控制的影响，评价了压紧对疲劳裂纹控制的实用价值。在高频机器上进行了弯曲和扭转试验。研究了不同形状和深度的铸造区，比较了载荷循环次数与裂纹萌生的关系。结果表明，在弯曲和扭转方面，铸钉的耐久性分别提高了约10倍和5倍。这种疲劳寿命的增加对应于100万次循环后超过50%的动载荷。铸模形状和深度的变化没有产生任何显著的差异。
Cracking of intramedullary nails, starting at the proximal end of the partial slot and propagating in a circumferential direction, has been observed. These partial cracks are relatively frequent, although full failures are very rare and do not disturb fracture healing. Coining is a cold-working process used to improve the endurance of structures with residual compressive stresses generated by plastic deformation. The influence of coining was investigated to evaluate its practical value in controlling these fatigue cracks. Bending and torsional tests were performed on high frequency machines. Coined zones of different shapes and depths were examined, comparing the elapsed number of load cycles with crack initiation. The results showed that the endurance of coined nails was improved by factors of approximately 10 and 5 in bending and torsion, respectively. This increase in fatigue life corresponds to a more than 50% larger dynamic load after a million cycles. Variations in coining shape and depth did not yield any significant differences.