Method to Calculate the Yield Load of Bone Plate in Four-point Bending Test
10.3969/j.issn.1671-7104.2015.05.017
- VernacularTitle:接骨板四点弯曲测定中屈服载荷的获取方法
- Author:
Xiaohang JIA
1
;
Jun ZHOU
;
Jun MA
;
Yan WEN
Author Information
1. 国家食品药品监督管理局杭州医疗器械质量监督检验中心
- Keywords:
test method;
bone plate;
four-point bending;
yield load
- From:
Chinese Journal of Medical Instrumentation
2015;(5):363-366
- CountryChina
- Language:Chinese
-
Abstract:
This paper developed a calculation method to acquire the yield load P of bone plate during four-point bending test. This method is based on the displacement—force (δ-F) curve function fM(δ) obtained from the test, each slope of the curve was calculated using piecewise smooth function and the line segment infM(δ) elastic deformation area was searched by setting the minimum slope T. Slope S was obtained through linear fit so as to build paralel displacement functionfL(δ). Then, approximating intersection point offM(δ) andfL(δ) was obtained through linear interpolation. Thus, yield load P was acquired. The method in the paper was loyal to YY/T 0342—2002 regulation and was liable to program calculation. The calculating process was nothing to do with whether the initial point during the test was preloaded or unloaded, and there was no need to correct the original point. In addition,T was set in an ideal fitting level guaranteed by the fitting coefficient of determinationR2, and thusS was very close to the real value, andPwas with a high accuracy.
