Novel test method for measuring circumferential elastic modulus and Poisson's ratio of composite pipe

Abstract

The invention discloses a novel test method for measuring the circumferential elastic modulus and Poisson's ratio of a composite pipe, which is called as an arc-shaped test piece tensile test method. According to the method, the circumferential elastic modulus and Poisson's ratio of the composite pipe are measured by tensioning an arc-shaped test piece cut along the circumferential direction of the composite pipe, and two wedge-shaped self-locking clamps for fixing the end parts of the arc-shaped test piece are respectively connected with a tensile testing machine through a specially designed one-way hinge for absorbing out-of-plane bending deformation of the arc-shaped test piece in the initial test stage. In addition, the test method provides specific and definite provisions for preparation of the arc-shaped test piece, a tensile test device, a tensile loading system, a circumferential elastic modulus and Poisson's ratio calculation method, the application range of the test method and the like. The method is simple to operate, accurate in measurement result and wide in applicability, and belongs to the technical field of fiber reinforced composite material tensile tests. 本发明公开了一种测量复材管环向弹性模量和泊松比的新型试验方法，称之为弧形试件拉伸试验方法。本方法通过张拉沿复材管环向截取的弧形试件来测取复材管的环向弹性模量和泊松比，其中固定弧形试件端部的两个楔形式自锁夹具分别通过一个专门设计的单向铰与拉伸试验机相连，用以吸纳试验初始阶段弧形试件的平面外弯曲变形。另外，本试验方法对弧形试件的制备、拉伸试验装置、拉伸加载制度、环向弹性模量和泊松比计算方法，以及本试验方法的适用范围等都给出了具体而明确的规定。本发明操作简单，测量结果准确，适用性广，属于纤维增强复合材料拉伸试验技术领域。