Modelling the effects of superimposed ultrasonic vibrations on tension and compression tests of aluminium
Modelling the effects of superimposed ultrasonic vibrations on tension and compression tests of aluminium
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DOI：
10.1016/j.jmatprotec.2006.12.032
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发表时间：
2007-05-07
影响因子：
6.3
通讯作者：
Huang, Zhihong
中科院分区：
文献类型：
--
作者：
Daud, Yusof;Lucas, Margaret;Huang, Zhihong
本文研究了在铝的拉伸和压缩试验中，在下压板上叠加超声振动的影响。通过测量的振荡力响应以及静态力，它表明，从这些测试的实验得出的应力-应变数据不满足一个简单的振荡应力叠加模型的描述。建立了拉伸和压缩试验的有限元模型，并对压缩试验模型进行了接触摩擦条件的描述。通过将超声振动的下压板在塑性变形期间的间隔，有限元模型预测的应力-应变关系满足一个简单的振荡应力叠加模型。有限元模型，然后进一步发展，以调查预测的应力-应变关系，如果一个较软的材料模型，仅在超声波激励的间隔。对于拉伸试验模型，这允许预测的应力-应变数据与实验得出的数据相匹配。对于压缩试验模型，通过将较软材料模型描述与接触表面处摩擦系数的变化相结合，仅在超声激励的间隔期间，有限元模型预测的应力-应变数据与实验得出的应力-应变数据相匹配。研究表明，仅用振荡应力叠加和接触摩擦来解释超声激励在金属成形过程中的作用是不够的。(c)2007 Elsevier B. V.保留所有权利。
This paper presents a study of the effects of superimposing ultrasonic vibrations on the lower platen in tension and compression tests of aluminium. By measuring the oscillating force response as well as the static force, it is shown that the experimentally derived stress-strain data from these tests does not satisfy the description of a simple oscillatory stress superposition model. Finite element models of tension and compression tests are created and a description of the contact friction condition is included for the compression test model. By incorporating ultrasonic vibration of the lower platen for an interval during plastic deformation, the finite element model predicts that the stress-strain relationship satisfies a simple oscillatory stress superposition model. The finite element models are then developed further to investigate the predicted stress-strain relationship if a softer material model is incorporated only during the interval of ultrasonic excitation. For the tension test model, this allows the predicted stress-strain data to match the experimentally derived data. For the compression test model, by combining a softer material model description with a change in the coefficient of friction at the contact surface, only during the interval of ultrasonic excitation, the finite element model predicted stress-strain data matched the experimentally derived stress-strain data. The study indicates that it is not sufficient to explain the effects of ultrasonic excitation in metal forming processes only in terms of oscillatory stress superposition and contact friction. (c) 2007 Elsevier B.V. All rights reserved.