Auslegung von Probekörpern aus Hartschaum zur Ermittlung der biaxialen Zugfestigkeit

Auslegung von Probekörpern aus Hartschaum zur Ermittlung der biaxialen Zugfestigkeit
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设计硬质泡沫试样以确定双轴拉伸强度

DOI:
10.1007/s10010-014-0175-9
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发表时间:
2014
期刊:
Forschung im Ingenieurwesen
影响因子:
--
通讯作者:
Dierkes
Dierkes
中科院分区:
--
文献类型:
--
作者:
Kolupaev;Becker;Massow;Dierkes

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目前,由硬质聚合物泡沫制成的部件具有许多应用。然而,这些部件的设计是基于主要从拉伸、压缩、扭转和静水压力下的样本测试中获得的强度值。需要进一步的载荷条件来验证适合于材料行为描述的调整强度假设。这对于多轴拉伸尤其重要:目前几乎没有考虑平衡双轴和静水拉伸载荷的测量方法。首先,开发了一个合适的实验装置,可以用传统的拉伸试验机实现。除了平衡的双向应力状态外,还可以产生双向拉伸应力状态,这种简单的力分配方式需要特殊的试件形状。下面介绍两种不同的硬泡沫试样的设计。将泡沫材料视为准均质各向同性材料,在确定试件尺寸时,假设泡沫材料为线弹性。用莫尔-库仑强度假设计算了试件在加载条件下的应力。通过样本的几何形状使力引入位置之间的缺口中出现的最大应力最小化,以确保试验区域失效。试件的尺寸适合于商业生产的泡沫块。不幸的是,很难实现静水拉伸下的失效。根据拉伸和平衡双向拉伸试验结果,提出了静水应力的估算方法,并在确定试件尺寸时加以考虑。
At present parts made of hard polymer foams have many application. The design of these components is however based on the strength values gained primarily from tests on specimens under tension, compression, torsion and hydrostatic compression. Further loading conditions are required for the validation of an adjusted strength hypothesis appropriate for the description of the material behavior. This is especially important for multi-axial tension: there are almost no measurements existing that consider balanced biaxial and hydrostatic tensile loads.First, a suitable experimental setup is developed, which can be realized with a conventional tensile testing machine. In addition to the balanced biaxial stress state further biaxial tension stress states can be generated.The simple manner of force distribution requires a special form of the specimen. The following paper describes the design of two different hard foam specimens. The foam is considered as quasihomogeneous isotropic material.Linear elastic behavior of the foams is assumed for the dimensioning of the specimen. The stresses arising in the specimen under loading are assessed with the strength hypothesis ofMohr–Coulomb. The maximal stress occurring in the notches between the locations of force introduction are minimized by the geometry of the specimen, in order to assure failure in the test area. The dimensions of the specimens are adapted to the commercially produced foam blocks.Failure at hydrostatic tension unfortunately can hardly be realized. Based on the experimental results from tension and balanced biaxial tension, the estimation of the hydrostatic stress is proposed and can be is also considered in the dimensioning of the test specimens.
双轴应力下灰铸铁的屈服面
DOI: --
发表时间: 1994
期刊:
影响因子: --
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用于研究材料双轴屈服的可能样本
DOI: --
发表时间: 1967
期刊:
影响因子: --
作者:
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通讯作者: J. Marin