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小能量多冲试验在材料研究和生产实践中已受到重视。本文对现行的多冲试验中的多冲抗力问题进行了探讨,对多冲曲线进行了解释,指出了现行方法所存在的缺陷。作者用材料疲劳破坏的观点来研究材料多冲抗力的途径是合理的。如果能在动态断裂韧度与多冲抗力之间建立关系,将是非常有用的。作为印证作者的观点,对三点弯曲和四点弯曲下的多冲问题进行了实际试验和分析计算的对比验证。根据文中的论点,作者认为现行的多冲抗力曲线是可以根据材料其它机械性能,如冲击韧度α_k和材料的持久极限σ_r或强度极度σ_b的折算来获得。这是有很大意义的,但尚需通过具体的折算例子与实验测定值进行比较和验证。至于作者强调以应力为参量来作为材料对于抗多冲能力的衡量依据(类似于通常的持久极限那样),此仅用多冲寿命N来衡量要优越。但实际上用能量作用参量可能更便于应用。
Small energy multi-red test in material research and production practices have been valued. In this paper, the multi-impact resistance test in multi-impact test is discussed. The multi-impact curve is explained, and the defects of current method are pointed out. It is reasonable for the author to study the material multi-impact resistance from the viewpoint of material fatigue failure. It would be very useful if there was a relationship between dynamic fracture toughness and multiple impact resistance. As a proof of the author’s point of view, the three-point bending and four-point bending under the multi-red test the actual test and analysis of comparative verification. According to the argument in the article, the author believes that the current multi-impact resistance curve can be obtained according to other mechanical properties of the material, such as the impact toughness α_k and the material endurance limit σ_r or the strength limit σ_b. This is of great significance, but we still need to compare and verify with the experimentally measured values through concrete examples. As the author emphasizes that using stress as a measure of material resistance to overshoot capability (similar to the usual endurance limit), this is only measured by the multi-life-span N. In practice, however, it may be easier to apply the parameters of energy.