en pt de ja ja ja ja en en en ja ja ja ja ja ja ja ja zh de pt ja ja ja ja ja ja ja ja ja ja ja ja ja ja en en en en en en en en en ja ja ja en en ja ja ja ja ja pt de ja ja ja ja en en en ja ja ja ja ja ja ja ja zh en en en en en en en en de en mg en zh en an en mg en zh en en en en en en th en en sv th fr en de th en en en en en cy en pt en fi en en it en ja en en en en
OS-V: 0900 Constant Amplitude Stress-Life Analysis
A notched test specimen is subjected to tensile loading and a Constant Amplitude Stress-Life Analysis is performed using OptiStruct.
NAFEMS Linear Elastic
NAFEMS Thermo-elastic
NAFEMS Heat Transfer
NAFEMS Nonlinear Static Analysis
NAFEMS Dynamic Response Analysis
NAFEMS Random Response Analysis
NAFEMS Normal Modes Analysis
NAFEMS Composites
Response Spectrum Analysis
OS-V: 0900 Constant Amplitude Stress-Life Analysis
A notched test specimen is subjected to tensile loading and a Constant Amplitude Stress-Life Analysis is performed using OptiStruct.
本セクションでは、OptiStructに関してよくある代表的な質問についてお答えしています。
本マニュアルでは、NAFEMSの問題を含めた検証モデルの解を紹介しています。
OS-V: 0900 Constant Amplitude Stress-Life Analysis
A notched test specimen is subjected to tensile loading and a Constant Amplitude Stress-Life Analysis is performed using OptiStruct.
Search Help
OS-V: 0900 Constant Amplitude Stress-Life Analysis
A notched test specimen is subjected to tensile loading and a Constant Amplitude Stress-Life Analysis is performed using OptiStruct.
The Stress-Life result from OptiStruct is compared with the results from eFatigue calculator, for the element 215576.
図 1. Model with Loading Conditions
Benchmark Model
The model is a test specimen of thickness 9.5mm, subjected to tensile loading of 1150 N at circular holes, normal to the notch. The model was meshed with first-order shell elements and the loading is applied to RBE3 elements that are connected to the holes. The Signed von Mises (SGVON) combined stress was used.
The material used is Steel RQC-100:
Material Properties
Young's modulus
Poisson's ratio
Ultimate tensile strength (UTS)
Fatigue strength coefficient (SRI1)
First fatigue strength exponent (B1)
Cycle limit of endurance for one segment SN curve (NC1)
1000000 cycles
A constant amplitude load is applied in the FATLOAD entry with a scale factor of 14.1332, whose variation is:
Time Points
Load Curve Point
図 2. Load Curve used in FATLOAD
All the modifying factors (Surface Roughness and Fatigue Strength Reduction factor) are set to 1.0.
Comparison of the Stress-Life results between OptiStruct and eFatigue calculator for element 215576.
(Target Value)
Normalized with the Target Value
152000 cycles
151881 cycles
Model Files
必要なモデルファイルのダウンロードについては、モデルファイルへのアクセスを参照してください。
The model file used in this problem includes:
stress_life_fatigue.fem
© 2022 Altair Engineering, Inc. All Rights Reserved.
Intellectual Property Rights Notice | Technical Support