层合板连接结构挤压强度测试方法的研究

The Research on the Compressive Strength Test Method for Lamination Connecting Structure

利用单钉单剪层合板连接结构挤压性能测试方法和单钉双剪层合板连接结构挤压性能测试方法 (ASTM D 5961A/B),对T700/5429开孔层合板螺栓连接结构的挤压性能进行试验研究,分析不同测试方法对开孔层合板连接结构挤压性能的影响。研究表明:两种试验方法中层合板连接构件均在连接孔处出现有效的挤压破坏形式,但单剪连接试验的稳定性差,影响因素较多,试验数据的离散性较大,且测得的连接结构的极限挤压强度和偏移挤压强度均低于双剪试验的结果。因此,双剪试验方法更适合用于复合材料层合板连接结构设计中挤压许用值的测量。

Two different test methods are used to test the compressive properties of T700 /5429 laminated connecting structure. The composites laminations are both connected with a single bolt,but in one test method,the sample is under the state of single side shearing and in the other test method the sample is under the double side shearing. The effect of different test methods on the compressive properties of the sample is analyzed. It is shown that effective compressive failure mode appear at the connecting hole of the sample in the two test methods. But in the single side shearing test method,the stability of the test is poor and the discreteness of the testing data is large. And the limited compressive strength and the offset compressive strength tested based on the single side shearing test method is lower than that of the double side shearing test method. So the double side shearing test method is more suited to test the allowable value of the composites laminated connected structure.