A model for predicting residual stiffness of unidirectional SiC/SiC composite under stress oxidation environment

2019 ◽  
Vol 27 (8) ◽  
pp. 753-775 ◽  
Author(s):  
Yan Xiong ◽  
Xuming Niu ◽  
Xihui Chen ◽  
Zhigang Sun ◽  
Hongyu Li ◽  
...  
Keyword(s):  
Residual Stiffness

Analytical Simulation of Dynamically Equivalent Components

1986 ◽  
Vol 108 (4) ◽  
pp. 394-400
Author(s):  
Z. N. Ibrahim
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Model ◽  
Single Degree Of Freedom ◽  
Residual Mass ◽  
Single Degree ◽  
Modal Synthesis ◽  
Stiffness Matrices ◽  
Analytical Simulation ◽  
Modal Mass ◽  
Residual Stiffness

The inertia concept of modal mass was developed to provide a consistent methodology for establishing an analytically equivalent dynamic model of any discrete section within a complex piping network. The multidegree of freedom system is reduced to several multiple excitation single degree of freedom (SDOF) systems representing its modal masses and modal stiffnesses. The multiple excitation residual mass and residual stiffness matrices were also formulated. The combination of modal mass-modal stiffness SDOF systems and residual mass-residual stiffness matrices can simulate the complete dynamic characteristic of any desired portion of the piping network. This technique was extended to cover substructuring applications, and was proved mathematically to be equivalent to the conventional modal synthesis formulation.

scholarly journals Model considering residual stiffness and stiffness discontinuity of bolted joints

2021 ◽  
pp. 63-75
Author(s):  
Sheng-Ao Wang ◽  
Min Zhu ◽  
Zi-Jian Xu ◽  
Ming Guo ◽  
Biao Li ◽  
...  
Keyword(s):  
Bolted Joints ◽  
Residual Stiffness

scholarly journals Experimental and Analytical Study on Residual Stiffness/Strength of CFRP Tendons under Cyclic Loading

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5653
Author(s):  
Chao Wang ◽  
Jiwen Zhang
Keyword(s):  
Residual Strength ◽  
Analytical Study ◽  
Damage Model ◽  
Fatigue Loading ◽  
Fatigue Tests ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Proposed Model ◽  
Residual Stiffness

Based on tension–tension fatigue tests, this paper investigated the mechanical property degradation of carbon fiber reinforced polymer (CFRP) tendons from a macroscopic perspective. According to the degradation regularity, this paper proposed a normalized phenomenological fatigue model based on the residual stiffness/strength of CFRP tendons during the fatigue loading process. In this paper, the residual stiffness of CFRP tendons were tested at five stress ranges, while the residual strength was tested at four stress ranges. In order to validate the reliability and applicability of proposed fatigue damage model, the predictions of proposed model and cited models from the literature are discussed and compared. Furthermore, experimental results from literatures were adopted to verify the accuracy of the proposed model. The results showed that the proposed model is applicable to predict both residual stiffness and residual strength throughout fatigue life cycle and has a better accuracy than models from the literature. Moreover, the three-stage degradation can be observed from the degradation processes of stiffness and strength at each stress level.

Parametric Study of the Modulus of Residual Stiffness for Sandwich Beams

2003 ◽  
Vol 40 (02) ◽  
pp. 141-148
Author(s):  
Deborah Weissman-Berman ◽  
David E. Jones
Keyword(s):  
Test Data ◽  
Parametric Study ◽  
Sandwich Beams ◽  
Test Results ◽  
Excellent Correlation ◽  
Governing Factor ◽  
Beam Equations ◽  
Materials Used ◽  
Current Database ◽  
Residual Stiffness

A sandwich structure is defined by a bi-geometrical structure and substructure related by the modulus of residual stiffness, α. These two geometries interact with each other to modify the response of the whole. This parametric study of the modulus of residual stiffness derives for a range of 10 core materials used in the marine, aerospace, and construction industries, each core bonded to a range of one to seven skin layers. Test results for measured and predicted show consistently good correlation for the current database 2000, and for results measured in 1995, 1997, and 1998. The predicted results are used in the COREDES (Engi, Inc., North Fort Myers, FL) structural beam equations, which calculate the loads, de-flection, stress, and the bilinear elastic curve for structural sandwich panels. The correlation to three-beam test data results is very good overall for one-to three-layer fiberglass skins on a standard thickness core, and these results clearly show has no effect on predictive results above five skin layers. The excellent correlation of these plotted comparisons of predictive data to test data indicates that this modulus is an important governing factor in the response of sandwich beams.

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