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Volume 56 Issue 2
Apr.  2021
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Article Contents
Journal of Southwest Jiaotong University  > 2021  >  56(2): 411-419.
ZHENG Jing, RAO Shaokai, ZHOU Jun, YANG Dan, SHEN Lixin, HUANG Shuhao. Fracture Analysis and Failure Mechanism of TA3 Limited Contact-Dynamic Compression Plates[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 411-419. doi: 10.3969/j.issn.0258-2724.20190182
Citation: ZHENG Jing, RAO Shaokai, ZHOU Jun, YANG Dan, SHEN Lixin, HUANG Shuhao. Fracture Analysis and Failure Mechanism of TA3 Limited Contact-Dynamic Compression Plates[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 411-419. doi: 10.3969/j.issn.0258-2724.20190182
shu

Fracture Analysis and Failure Mechanism of TA3 Limited Contact-Dynamic Compression Plates

doi: 10.3969/j.issn.0258-2724.20190182
  • Received Date: 19 Mar 2019
  • Rev Recd Date: 09 May 2019
    • Available Online: 13 Oct 2020
  • Publish Date: 15 Apr 2021
    Abstract
  • To investigate the fracture mechanism of TA3 pure titanium limited contact-dynamic compression plates (LC-DCP) during service in the body. 7 clinically fractured TA3 pure titanium LC-DCP were collected and sterilized, and their fracture surfaces were examined using chemical composition analyzer, Vickers hardness tester, optical microscope, and scanning electron microscope. A three-dimensional finite element model of middle femoral transverse fracture treated by TA3 pure titanium LC-DCP was established, and then the fracture healing and bone plate stress were analyzed using ANSYS software. The results show that the physical and chemical properties of the 7 LC-DCP are qualified, fracture occurs around the middle screw hole on the bone plates. Fatigue striations and secondary cracks appear on the fracture surface, and the regions of crack initiation, propagation and transient fracture, have same elemental compositions. For the patients walking prematurely, the maximum shear stress of bone plates occurs at the middle screw hole and it exceeds the yield strength of TA3 pure titanium. In sum, the fracture failure of the TA3 pure titanium LC-DCP in body is mainly resulted from patients walking prematurely, at the condition, cracks are initiated at the middle screw hole on the bone plate surface, and fatigue fracture occurs under the action of complex cyclic loading.

     

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