期刊
POLYMER TESTING
卷 90, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106643
关键词
Scratch test; Rockwell C diamond Indenter; Polycarbonate; Fracture toughness; Stress state analysis
资金
- National Natural Science Foundation of China [51705082, 51875106]
- Engineering Research Centre for CAD/CAM of Fujian Provincial Colleges and Universities [K201705]
- Fujian Provincial Minjiang Scholar Program [0020-510486]
Rockwell C diamond indenter with a spherical tip of radius of 108 mu m was used to slide on bulk polycarbonate under linearly increasing normal load from 5 mN to 20 N in order to investigate deformation and damage of ductile polymers during scratching. The peak value of the ratio of residual depth over penetration depth corresponds to a critical normal load, which can be used as the piecewise point for the subsection functions describing variation of tangential load, penetration depth and residual depth with normal load. The true adhesion interfacial friction coefficient was found to be 0.3 for contact between PC and diamond by three-dimensional model. Residual groove widths were found to be proportional to the square root of normal load, and provided useful information to characterize the radius of spherical tip. Values of fracture toughness of PC obtained by scratch-based methodologies under sufficiently large normal loads associated with brittle fracture and crack plane, are in excellent agreement with literature values. The material is under triaxial compressive stress state, making the flow and shear stresses much larger than the ones for uniaxial tensile test.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据