基于数字散斑相关法的金属材料力学性能的测试

Application of digital speckle correlation mthod(DSCM-2D)in testing metal materials mechanical property

数字散斑相关技术以其非接触,可以采用自然光,甚至利用材料表面天然纹理就可以进行位移、应变测试,在土木、机械和生物医学领域等得到了广泛应用,被学术界和工业界进一步研究和工程中所采用。为明确硬质材料受力后的位移分布和应变分布,为应用提供实验依据。在金属材料位移场和应变场的测试中采用了高精度的数字散斑相关技术,并利用自然光对金属材料进行了非接触式测量,得到了由外力引起的横向和纵向的变形及应变等力学参量,数字散斑所测结果与电阻应变计结果吻合较好。表明数字散斑相关测量技术应用于硬质材料力学参量有效,能够较好地解决了力学量测试工作。

Digital speckle correlation method（DSCM）is widely used in civil,mechanical and biomedicine fields for its non-contact,natural light adopted during collecting data,even natural vein of material surface being utilized in testing displacement and strain without any treatment,therefore it is further studied by academic and industry circles and adopted in engineering.In order to clear and definite the displacement and strain distributions of hard material after being stressed and provide experiment data for applications in engineering,high precious digital speckle correlation method（DSCM）is adopted for testing the displacement fields and strain fields of the metal.The test for non-contact and nature light is used during the experiment as well.Thus,mechanics parameters for lateral and longitudinal deformation because of foreign force and strains are obtained.While the results tested through digital speckle coincides with that tested by resistance strain gauge,which indicates that the DSCM is applied in testing mechanical parameter of hard material effectively,through which testing of mechanical parameters is settled.