We conducted an experimental investigation on the flexural behavior of closed-cell aluminum foam beam under shear stress effect. Three-point bending and flexural vibration tests were carried out and the shear stress effect was generated by changing the specimen’s length. From the bending test, the measured deflection was used to quantify the flexural modulus. From the vibration test, the measured natural frequencies of flexural vibration mode were used to calculate the flexural modulus. The results show that the flexural moduli obtained from both tests agree well. Then, the flexural modulus value was compared with the theoretical value estimated by Timoshenko’s beam theory. As a result, the experimental value was found to be much smaller than the theoretical value when shear stress effect is dominant. Does this mean Timoshenko’s theory cannot describe the flexural behavior of aluminum foam beam? How to fit Timoshenko’s theory with the experimental data is discussed. Moreover, the reason why the flexural modulus was remarkably degraded under shear effect is elaborated.

我们对剪切应力作用下闭孔泡沫铝梁的弯曲行为进行了实验研究。进行了三点弯曲和弯曲振动测试，并通过改变试样的长度来产生剪应力效应。根据弯曲测试，使用测得的挠度来量化挠曲模量。从振动测试中，将测得的挠曲振动模式固有频率用于计算挠曲模量。结果表明，从两个测试中获得的弯曲模量吻合良好。然后，将弯曲模量值与蒂莫申科梁理论估计的理论值进行比较。结果，发现当剪切应力效应占主导时，实验值比理论值小得多。这是否意味着季莫申科的理论不能描述泡沫铝梁的弯曲行为？讨论了如何将蒂莫申科的理论与实验数据进行拟合。此外，阐述了在剪切作用下弯曲模量显着降低的原因。