这项研究的重点是评估在数字图像相关(DIC)技术中使用的简化设备的灵敏度和局限性,将它们与模拟引伸计进行比较,基于玻璃纤维和环氧树脂制成的复合材料的力学性能数据。目标包括建立基于文献的方法论,通过手动层压制作样品,根据ASTMD3039和D3518标准进行机械测试,将DIC与试验机的模拟引伸计进行比较,并将实验结果与经典层压板理论进行对比。制作了三个具有特定堆叠顺序([0]3,[90]4和[±45]3)的复合板,并提取样品进行测试以确定拉伸强度,弹性模量,和其他属性。DIC用于在测试期间捕获变形场。从模拟引伸计和DIC获得的数据之间的比较显示,纵向弹性模量E1的差异为11.1%,E2的差异为5.6%。在低变形条件下,由于设备限制,DIC显示出较低的效率。最后,基于经典层压板理论的理论分析,使用Python脚本进行,估计的纵向弹性模量Ex和[±45]3层压板的剪切强度,突出表明Ex的理论值7136MPa与实验值5208MPa之间的相对差异为31.2%。
This study focused on evaluating the sensitivity and limitations of the simplified equipment used in the Digital Image Correlation (DIC) technique, comparing them with the analog extensometer, based on the mechanical property data of a composite made of fiberglass and epoxy resin. The objectives included establishing a methodology based on the literature, fabricating samples through manual lamination, conducting mechanical tests according to the ASTM D3039 and D3518 standards, comparing DIC with the analog extensometer of the testing machine, and contrasting the experimental results with classical laminate theory. Three composite plates with specific stacking sequences ([0]3, [90]4, and [±45]3) were fabricated, and samples were extracted for testing to determine tensile strength, modulus of elasticity, and other properties. DIC was used to capture deformation fields during testing. Comparisons between data obtained from the analog extensometer and DIC revealed differences of 11.1% for the longitudinal modulus of elasticity E1 and 5.6% for E2. Under low deformation conditions, DIC showed lower efficiency due to equipment limitations. Finally, a theoretical analysis based on classical laminate theory, conducted using a Python script, estimated the longitudinal modulus of elasticity Ex and the shear strength of the [±45]3 laminate, highlighting a relative difference of 31.2% between the theoretical value of 7136 MPa and the experimental value of 5208 MPa for Ex.