TC4钛合金蜂窝板高温力学性能

High Temperature Mechanical Properties of TC4 Titanium Alloy Honeycomb

摘要:

采用钎焊工艺制备了TC4钛合金蜂窝板,对试样在室温和高温下进行异面压缩、三点弯曲性能测试和分析,并对不同温度下的试件强度及破坏模式进行分析。研究表明钛合金蜂窝板的异面压缩模量与强度随着测试温度的升高而在下降,440 ℃时保有室温时的35.2 %、61.7 %。但测试温度对破坏模式没有影响。而三点弯曲测试中试件随着测试温度的升高、破坏模式发生改变、弯曲强度不断下降、最大挠度不断增加。且L向试件的弯曲性能明显高于W向试件。弯曲试件室温下面板为韧性断裂,钎焊区为脆性断裂,而300 ℃下试件面/芯脱粘区的断口为解理断口。

Abstract:

TC4 titanium alloy honeycomb sandwich panel is manufactured by high-temperature brazing. In this paper, the mechanical performance parameters and failure modes of honeycomb sandwich panel are experimentally investigated via flatwise compression and three-point bending test subject to different temperatures. It is found by the test that flatwise compression elasticity modulus and strength of the honeycomb sandwich panel at 440℃ decrease to 35.2% and 61.7% of that at room temperature, respectively, indicating that higher temperature may result in lower compression elasticity modulus and strength. It is also found that the test temperature has no effect on the failure mode. On the other hand, it is noted in the three-point bending test that the failure mode changes, the flexural strength decreases, and that the maximum deflection increases with the increasing test temperature. It is also found that the bending performance of specimens in the L-direction is better than the W-direction. In addition, the face sheet of the bending specimen is ductile fracture, and the brazing zone is brittle fracture at room temperature as revealed by the experiment, while the brazing joints of surface/core debonding failure specimen is cleavage fracture a high temperature of 300℃.