热力耦合试验中仿型橡胶皮囊拟静力加载分析

Quasi-Static Loading Analysis of Shaped Rubber Leather Bag in Thermal-Mechanical Coupling Testing

在回转体结构飞行器热力耦合试验中,试验件载荷加载有多种方式,需要考虑试验件结构的特殊性,并要达到试验预期的局部载荷加载效果.试验采用了仿型橡胶皮囊加载作为加载方式,通过Catia软件建立了仿型橡胶皮囊三维结构模型,利用Ansys软件得到了仿型橡胶皮囊的变形与应力分布.结果表明:在仿型橡胶皮囊内压为0.4 MPa的工况下,皮囊最大应力为0.08 MPa,最大变形为0.08 mm;随皮囊内压增大,皮囊大端与小端的边缘均产生应力集中,且小端的变形较大,易发生变薄、裂痕甚至破损等结构性破坏,应对该位置进行加厚处理;支撑工装内仿型橡胶皮囊拟静力加载应力分布均匀,满足试验需求.

In the thermal mechanical coupling test of rotational body structure vehicle,there are many ways to load the test pieces.In order to consider the special structure of test pieces,and the local load applying effect expected by the test is achieved.The shaped rubber leather bag is used as a loading method for this test.A three-dimensional structural model of shaped rubber leather bag is established by Catia software.The deformation and stress distribution of the shaped rubber leather bag are also obtained by Ansys software.The results show that:under the condition of 0.4 MPa internal pressure of the shaped rubber leather bag,the maximum stress of leather bag is 0.08 MPa and the maximum deformation is 0.08 mm.With the increase of the pressure in the shaped rubber leather bag,stress concentration occurs at the edges of both the large end and the small end,and the small end has a large deformation,which is prone to structural damage such as thinning,crack and even damage.Therefore,the thickening treatment should be carried out at this position.The stress distribution of loading is uniform by the shaped rubber leather bag in supporting tool,which can meet the test requirement.