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从型砂微变形的研究中表明，湿型粘土砂标准三锤试样在抗压力。载过程中，砂样首先是产生粘弹性变形。当砂样所受压应力达到某一值之后，砂样即开始粘塑性变形。这一使砂样由粘弹性变形向粘塑性变形转变的临界应力，称之为塑性变形临界值。用计算机技术和传感技术组成的型砂多项性能测试系统，通过抗压加载后松弛过程的动态测试，成功地解决了型砂塑性变形临界值的测定问题。该测试方法的应用对实现型砂性能检测、铸造生产管理和铸件质量控制具有现实意义。
From the study of micro-deformation of sand, it shows that the wet-type clay sand standard three-hammer specimen is under pressure resistance. In the process of loading, the sand sample first produces viscoelastic deformation. When the sample sand compressive stress reaches a certain value, the sand began to viscoplastic deformation. The critical stress that changes the sand sample from viscoelastic to visco-plastic deformation is called the critical value of plastic deformation. A multi-performance test system of molding sand composed of computer technology and sensing technology has successfully solved the problem of measuring the critical value of plastic deformation of sand by dynamic testing of the relaxation process after the anti-pressure loading. The application of this test method is of great realistic significance in the field of sand testing, foundry production management and casting quality control.