Member Nonlinearity

词汇表条目

Member nonlinearity is a property of member elements in the field of numerical strength analysis and deformation analysis.

Without further definition, the member elements react linearly elastically in and about all assigned degrees of freedom in such analysis. Basically, this behaviour is defined by Hooke's law, which states that the deformation u of a solid is proportional to the acting load F, or its strain Δl depends linerly on the acting force F.

In reality, not every element reacts linearly elastically. For example, a slender circular member, with regard to its cross-section resistance, absorbs more tension than compression. This property based on force can be conceived and simulated by means of member nonlinearity in the numerical calculation. In this case, the member strain depends on the acting force nonlinearly due to the premature stability failure (buckling) in the compression state.

Member nonlinearities exist in various forms. Usually, they do not depend on the forces relating linearly to each other, but on the final effect on the elements in the calculation.

Typical Member Nonlinearities

  • Failure under tension
  • Yielding when plastic resistance is reached
  • Rigid from the defined deformation u

Entering in RFEM and RSTAB

In RFEM and RSTAB, member nonlinearities can be entered and defined graphically via 'Insert' → 'Model Data' → 'Member Nonlinearities' → 'Dialog Box', or manually by using the Data Navigator or the corresponding tables.

关键词

member nonlinearity failure slippage tearing

目录

[1]   Werkle, H. (2008). Finite Elemente in der Baustatik (3rd ed.). Wiesbaden: Vieweg & Sohn.

链接

RFEM 主程序 RFEM
RFEM 5.xx

主程序

结构设计与有限元­分析软件(FEA)可以用于建立 平面与空间结构模型,适用于由杆件、面、 板、墙、折板、膜、壳、实体以及接触单元等的建模与分析计算。

首个许可价格
3,540.00 USD
RSTAB 主程序
RSTAB 8.xx

主程序

空间结构设计与分析软件,主要用于框架、梁与桁架等空间结构的建模与计算。可以输出内力、变形与制作反力的线性与非线性的计算结果。

首个许可价格
2,550.00 USD