摘要
针对两种仪器化压入仪和两种代表性压入测试方法:Oliver-Pharr方法和Ma方法,通过有限元数值模拟分析了仪器柔度标定误差对2种仪器和两种方法测试精度的影响。结果表明仪器柔度的标定精度直接影响压入测试结果的准确度,仪器柔度越小,测试精度越高;就测试方法而言,Ma方法具有比Oliver-Pharr方法更高的精度和更低的仪器柔度敏感性;对同一材料,压入深度越大,由仪器柔度标定误差引入的压入测试结果误差越大;当材料较硬且压入深度较大时仪器柔度的标定尤为重要,小量的标定误差导致测试结果严重偏离真值,甚至为负值。
Effect of machine compliance calibration errors on test accuracy are studied by means of finite element analysis using two kinds of instrumented indentation equipment and two representative indentation test methods： Oliver-Pharr method and Ma method. Results show that the test accuracy is directly influenced by the accuracy of machine compliance calibration errors; the smaller the machine compliance is, the higher the test accuracy is. In terms of test methods, Ma method has higher accuracy and lower sensitivity of machine compliance compared with Oliver- Pharr method. For the same material, the deeper the indentation depth is, the greater the test errors caused by compliance calibration errors are. When the material is harder and the indentation depth is deeper, machine compliance calibration is more important. A compliance calibration error of small value will lead to big windage between the test result and the real value; even the test result becomes negative.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2011年第9期2095-2100,共6页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(No.10672185)资助项目
关键词
仪器化压入
柔度
标定误差
弹性模量
instrumented indentation
compliance
calibration error
elastic modulus
