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刻槽试件的应力状态分析及超声拉伸疲劳极限试验研究
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国家自然科学基金资助项目(51475148);新乡市科技攻关计划项目(CXGG16021)


Stress state analysis of notch specimen and study on fatigue limit test of ultrasonic tensile
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    摘要:

    为了研究带裂纹工件在超声载荷下的疲劳性能,采用自行研制的超声振动单向拉伸实验装置,对刻槽20#钢进行了拉伸试验研究。设计了两端方板、中间为指数剖面、单侧边开有缺口的试件,对刻槽试件的应力状态进行了理论分析,得出了刻槽截面的正应力分布公式。通过改变工件的槽深t和曲率ρ,得出疲劳极限随刻槽深度的加深而降低,在某一深度时达到最小值,然后随之上升;疲劳极限随刻槽曲率的减小而下降,在某一曲率值时达到最小值,然后随之上升。该试验证明了疲劳极限不仅与应力集中系数有关,还与刻槽深浅、应力梯度和其他参数有关,具体工作还需要进一步研究。

    Abstract:

    In order to study the fatigue performance of cracked workpiece under ultrasonic loading, the tensile test of notched 20 steel was carried out by selfdeveloped ultrasonic uniaxial tensile test device. The specimen is designed that the both ends are square board, the middle is index profile, and single side opened a gap. The stress state of the notch specimen is theoretically analyzed, and the positive stress distribution formula of the notch groove section was obtained. By changing the notch groove depth t and curvature ρ of the specimen, it is obtained that the fatigue limit decreases with the deepening of the notch groove depth, reaching a minimum at a depth and then rising; the fatigue limit decreases with the decrease of the notch groove curvature, and reaches the minimum at a certain curvature, and then rises. The test shows that the fatigue limit is not only related to the stress concentration coefficient, but also to the depth of the grooves, stress gradient and other parameters,and the present work shows it is necessary to further study in this research field.

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程雪利,马秉馨,秦军.刻槽试件的应力状态分析及超声拉伸疲劳极限试验研究[J].机床与液压,2019,47(12):39-45.
. Stress state analysis of notch specimen and study on fatigue limit test of ultrasonic tensile[J]. Machine Tool & Hydraulics,2019,47(12):39-45

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  • 在线发布日期: 2020-02-20
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