ISO/TR 29381:2008描述了使用仪器化压痕测试评估金属材料拉伸性能（真实应力-应变曲线和导出参数）的方法。 仪器化压痕试验的应用范围符合ISO 14577-1:20 02的分类，但推荐的力范围为2 N至3 kN。 ISO/TR 29381:2008包括以下三种方法，所有这些方法原则上都是合理的，能够实际使用，并且适用于指定的材料。 方法一:代表性应力应变； 方法2:FEA反分析； 方法3:神经网络。 在每种方法中，拉伸曲线都是从实验测量的压痕力-深度曲线导出的，从中评估压痕拉伸性能。所描述的三种方法都需要不同的用户策略和能力来获得压痕拉伸性能。每种方法所需的信息不同，并详细描述。 三种方法中的主要假设是试件内不存在残余应力。存在的残余应力会影响压痕拉伸性能的估计。给出了使用仪器化压痕试验评估残余应力的程序以供参考。

ISO/TR 29381:2008 describes methods for evaluating tensile properties of metallic materials (true stress-strain curve and derived parameters) using an instrumented indentation test. The ranges of application of instrumented indentation tests are in line with the classification of ISO 14577-1:2002, but the range of force recommended is from 2 N to 3 kN. ISO/TR 29381:2008 includes the following three methods, all of which are sound in principle, are capable of practical use and are appropriate for the specified materials.

• Method 1: representative stress and strain;
• Method 2: inverse analysis by FEA;
• Method 3: neural networks.

In every method, tensile curves are derived from the experimentally measured indentation force-depth curve, from which indentation tensile properties are evaluated. The three methods described all need different user strategies and abilities to obtain the indentation tensile properties. The information required differs for each method, and is described in detail. The main assumption in the three methods is the absence of residual stress within the test piece. Existing residual stress can affect the estimation of indentation tensile properties. A procedure for evaluating residual stress using an instrumented indentation test is given for reference.