Acoustical and Optical Determination of Mechanical Properties of Inorganically-Bound Foundry Core Materials
Acoustical and Optical Determination of Mechanical Properties of Inorganically-Bound Foundry Core Materials
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DOI：
10.3390/ma13112531
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发表时间：
2020-06-01
期刊：
影响因子：
3.4
通讯作者：
Volk, Wolfram
中科院分区：
文献类型：
--
作者：
Lechner, Philipp;Fuchs, Georg;Volk, Wolfram
许多轻金属铸造厂使用无机结合砂芯在铸件中形成空腔，这是模具本身无法实现的。为了实现芯材的有限元模拟，必须测量其机械性能。本文采用了确定砂岩心杨氏模量、剪切模量、泊松比和破裂应变的方法。这使我们能够充分参数化一个理想的脆性有限元模型。我们发现杨氏模量和剪切模量可以通过脉冲激励技术在声学上得到。采用高速摄像机和数字图像相关算法测量断裂应变。
Inorganically-bound sand cores are used in many light-metal foundries to form cavities in the cast part, which cannot be realised by the mould itself. To enable FEM simulations with core materials, their mechanical properties have to be measured. In this article, we adapt methods to determine the Young's and shear modulus, the Poisson ratio and the fracture strain of sand cores. This allows us to fully parametrise an ideal brittle FEM model. We found that the Young's and shear modulus can be obtained acoustically via the impulse excitation technique. The fracture strain was measured with a high-speed camera and a digital image correlation algorithm.