期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2017
卷号：8
期号：6
页码：523-536
出版社：International Energy and Environment Foundation (IEEF)
摘要：The present work investigates beam natural frequency that includes the effect of oblique crack damage with variable parameters such as crack size and location. This study was investigated both numerically and experimentally. The predicted results were compared to the measured data, where a good agreement has been observed. The beam natural frequency is evaluated for beam composite materials compound from polyester resin materials reinforced with two materials, which are glass short fiber and glass powder. The natural frequency is evaluated for different design parameters, which for composite material are the volume fractions of resin, fiber, and powder; while for crack effect they are the location, size, and orientation of the crack. The experimental results of natural frequency were evaluated through manufacturing composite beam samples, forming crack on it, testing it with vibration machine to measure the natural frequency. To numerically predict the natural frequency, tensile test samples of composite materials are manufactured firstly and then tested by tensile machine to find their mechanical properties, which are required as input data to the ANSYS Mechanical APDL commercial code. The natural frequency comparison has shown that the maximum error between the experimental and numerical data does not exceed 10.63%. The results reveals that increasing the crack orientation results in an enhancement in the natural frequency due to the reduction in the vertical crack component, while the increase in the crack size and location causes a decrease in the natural frequencies.
