矩形横截面试样最大弯曲应变的测量方法一般较多使用四点测量方式。但三点测量方式也有其优点，只有三测量通道。结构得以大大简化，实现自动化测量相对简单。通过推导，国家标准GB/T1040.4－2006和国际标准ISO527－4：1997附录B给出的三点式测定方法的计算公式有错误。
Methods for strainmeasurement of maximum bending strain for rectangular crosssectional specimen are generally more used in a fourpoint measurement, but the threepoint measurement approach also has its advantages. Since it has three measurement channels, the structure is greatly simplified, so that it is relatively simple to realize automation. Through the derivation, calculation formula for the threepoint measurement approach have errors in appendix B of GB/T1040.42006 and ISO5274:1997。
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