scholarly journals Application of Combined Sustained and Cyclic Loading Test Results to Alloy 617 Elevated Temperature Design Criteria

2014 ◽  
Author(s):  
Yanli Wang ◽  
Robert I Jetter ◽  
Sam Sham
Keyword(s):  
Elevated Temperature ◽  
Cyclic Loading ◽  
Design Criteria ◽  
Test Results ◽  
Loading Test ◽  
Alloy 617 ◽  
Cyclic Loading Test ◽  
Elevated Temperature Design

scholarly journals In Vitro Evaluation of the Tension Band Suture Method for Proximal Humerus Fracture Treatment

2020 ◽  
Author(s):  
Hideaki Ishii ◽  
Takanori Shintaku ◽  
Shu Yoshizawa ◽  
Misato Sakamoto ◽  
Takao Kaneko ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Tension Band ◽  
Proximal Humeral Fractures ◽  
Humeral Fractures ◽  
Test Results ◽  
Suture Materials ◽  
Loading Test ◽  
Cyclic Loading Test ◽  
Mechanical Durability

Abstract Background: Proximal humeral fractures are common, and more than half occur in patients over 65 years of age. Operative treatment may be recommended for displaced, complicated fractures; however, surgery may lead to displacement of the greater tuberosity or humeral head. Supplemental tension band sutures have been recommended to prevent such a complication. In this study, we investigate the best combination of suture, washer, and threading angle for proximal humeral fractures from a mechanical view.Methods: The mechanical durability of 18 combinations of suture materials (Fiberwire, Ethibond, and Surgilon), threading washers (ring washer, disc washer), and threading angles (15 or 45 degrees) were examined via a cyclic loading test. Results: The most durable combination in the cyclic loading test consisted of threading the Fiber Wire to the washer ring using only one hole (ring washer-1) at 45 degrees. In contrast, the most vulnerable combination was threading Ethibond to the washer disc at 15 degrees. Breakage of all suture materials occurred at the suture-washer interface, and no failure or loosening of the knots was observed. FiberWire gradually eroded until the loss of equilibrium; whereas the rupture of Ethibond and Surgilon occurred suddenly. Conclusions: From a mechanical viewpoint, we demonstrated that applying a supplemental tension band suture using FiberWire with a single-hole ring washer threaded at a wider angle is recommended.

Discrete element modeling of deformable pinewood chips in cyclic loading test

2019 ◽  
Vol 345 ◽  
pp. 1-14 ◽  
Author(s):  
Yidong Xia ◽  
Zhengshou Lai ◽  
Tyler Westover ◽  
Jordan Klinger ◽  
Hai Huang ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Discrete Element ◽  
Discrete Element Modeling ◽  
Loading Test ◽  
Cyclic Loading Test ◽  
Element Modeling

scholarly journals Biomechanical comparison of medial sustainable nail and proximal femoral nail antirotation in the treatment of an unstable intertrochanteric fracture

2020 ◽  
Vol 9 (12) ◽  
pp. 840-847
Author(s):  
Shaobo Nie ◽  
Ming Li ◽  
Hui Ji ◽  
Zhirui Li ◽  
Wenwen Li ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Torsional Stiffness ◽  
Proximal Femoral Nail ◽  
Axial Stiffness ◽  
Intertrochanteric Fractures ◽  
Loading Test ◽  
Cyclic Loading Test ◽  
Femoral Nail ◽  
Unstable Intertrochanteric Fracture ◽  
The Mean

Aims Restoration of proximal medial femoral support is the keystone in the treatment of intertrochanteric fractures. None of the available implants are effective in constructing the medial femoral support. Medial sustainable nail (MSN-II) is a novel cephalomedullary nail designed for this. In this study, biomechanical difference between MSN-II and proximal femoral nail anti-rotation (PFNA-II) was compared to determine whether or not MSN-II can effectively reconstruct the medial femoral support. Methods A total of 36 synthetic femur models with simulated intertrochanteric fractures without medial support (AO/OTA 31-A2.3) were assigned to two groups with 18 specimens each for stabilization with MSN-II or PFNA-II. Each group was further divided into three subgroups of six specimens according to different experimental conditions respectively as follows: axial loading test; static torsional test; and cyclic loading test. Results The mean axial stiffness, vertical displacement, and maximum failure load of MSN-II were 258.47 N/mm (SD 42.27), 2.99 mm (SD 0.56), and 4,886 N (SD 525.31), respectively, while those of PFNA-II were 170.28 N/mm (SD 64.63), 4.86 mm (SD 1.66), and 3,870.87 N (SD 552.21), respectively. The mean torsional stiffness and failure torque of MSN-II were 1.72 N m/° (SD 0.61) and 16.54 N m (SD 7.06), respectively, while those of PFNA-II were 0.61 N m/° (SD 0.39) and 6.6 N m (SD 6.65), respectively. The displacement of MSN-II in each cycle point was less than that of PFNA-II in cyclic loading test. Significantly higher stiffness and less displacement were detected in the MSN-II group (p < 0.05). Conclusion The biomechanical performance of MSN-II was better than that of PFNA-II, suggesting that MSN-II may provide more effective mechanical support in the treatment of unstable intertrochanteric fractures. Cite this article: Bone Joint Res 2020;9(12):840–847.

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