Static

Features

Static structural analysis is an analytical method for predicting the mechanical behavior of an object when an external load is applied at a constant level (without changing over time).
The geometry of structures and parts, material properties, external load conditions, and constraint conditions are input to calculate behavior such as stress and displacement. This makes it possible to evaluate the conditions under which they can be used safely and the conditions under which damage or deformation will occur.
Static structural analysis, unlike Dynamic structural analysis where the external load changes with time, the external load is constant and does not change, so the effect of time is ignored. However, when accurately evaluating the deformation behavior of materials taking into account strain rate dependency (time-dependent material properties such as creep and viscoelasticity), it is important not to ignore the effect of strain rate over time, but to properly consider it.

Static structural analysis Details

Properties of resin composites

樹脂複合材料には、異方性のガラス繊維が強化材として含まれているため、射出成形後のガラス繊維の配向度によって物性が異なるという特性があります。実際に射出成形で作成した板状試験片から、角度を変えてダンベル状試験片を切り出して引張試験をすると、応力ひずみ曲線が異なります。構造解析の精度を高めるために、旭化成では繊維配向考慮の取り組みを行っています。

Images of test pieces cut at different angles (left) and their S-S curves (right)

Creep property of plastics

Creep is the phenomenon in which an object slowly deforms over time when a certain load is applied to it.
Resin undergoes creep even at room temperature, and resin creep is divided into three stages, eventually resulting in rupture.
Plastic has three stages of creep.
The primary stage involves significant deformation.
In the secondary stage, it is constantly deformed.
In the tertiary stage, the deformation is accelerated and finally breaks.