(1)拉力机可测定材料的力学性能。材料的各项强度指标，如屈服极限、强度极限、持久极限等以及材料的弹性性能，如弹性极限、弹性模量等，都是设计构件的基本参数和依据，而这些参数一般要通过拉力机实验来测定。随着材料科学的不断发展,越来越多的新型合金材料、合成材料不断出现，而其中的力学性能测定，是研究各种新型材料的首要任务。

(1) tensile machine can measure the mechanical properties of materials. The properties of materials, such as yield strength, ultimate strength, endurance and flexibility of the material properties such as elastic modulus, elastic limit, etc., are the basic parameters and component design basis, and these parameters are generally determined by tensile experiment. With the continuous development of materials science, more and more new alloy materials and synthetic materials are emerging, and the determination of mechanical properties is the most important task to study all kinds of new materials.

(2)验证已建立的理论。材料力学的理论公式都是以某些假设 为基础而推导出的，还必须通过拉力机实验来验证其正确性和适用范围。通过这类实验能增进感性知识，从而进一步深刻理解理论课的内容，明确理论、定理所适用的条件于新建立的理论和公式，用拉力机实验来验证更是必不可少的。

(2) verify the established theory. The theoretical formulas of material mechanics are deduced on the basis of some assumptions, and the validity and scope of application of tensile machine tests must be verified. Through this kind of experiment can enhance the perceptual knowledge, so as to further understand the content of theoretical courses, explicit theory, theorem conditions applicable to theory and a new formula is established, using tensile machine experiments is essential.

(3)拉力机应力分析。实验应力分析是由实验方法测定构件中的应力和应变状态的一门学科。通过拉力机应力分析可以检验和提高设计质量，可以提高工程结构的安全度和可靠性，并且达到减少材料消粍、降低生产成本和节约能源的要求。它还可以为发展新理论、设计新型结构、创造新工艺以及应用新材料提供依据。拉力机应力分析不仅可以推动理论的发展，而且能有效地解决许多理论上不易解决的工程实际问题，因此它和应力分析理论一样，是解决工程实际问题的一个重要手段。

(3) stress analysis of tensile machine. The experimental stress analysis is a subject of measuring stress and strain in component by experimental method. Through the tensile stress analysis can test and improve the quality of design, can improve the safety and reliability of engineering structure, and reduce the material consumption Zhe, reduce production cost and energy conservation requirements. It can also provide a basis for the development of new theories, design of new structures, creation of new processes and application of new materials. Tensile stress analysis can not only promote the development of the theory, but also can effectively solve many practical problems in theory is difficult to solve engineering, it and stress analysis theory, is an important means to solve practical engineering problems.