A Multi-Scale Viscoelastic Processing Model for Predicting Residual Stress Buildup in Thermoset Composites

2018 ◽  
Author(s):  
WEIJIA CHEN ◽  
DIANYUN ZHANG
Keyword(s):  
Residual Stress ◽  
Thermoset Composites ◽  
Multi Scale ◽  
Stress Buildup

scholarly journals Residual Stress Buildup in Ti Components Produced by Cold Spray Additive Manufacturing (CSAM)

2020 ◽  
Vol 29 (6) ◽  
pp. 1498-1507
Author(s):  
V. Luzin ◽  
O. Kirstein ◽  
S. H. Zahiri ◽  
D. Fraser
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Cold Spray ◽  
Stress Buildup

Assessment of Degrees of Cumulative Fatigue Crack Initiation Damage at Guyed Mast Earplate Joint

2011 ◽  
Vol 467-469 ◽  
pp. 776-781
Author(s):  
Wen Li Wang ◽  
Wei Lian Qu ◽  
Jie He
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Welding Residual Stress ◽  
Critical Plane ◽  
Multi Scale ◽  
Cumulative Strain ◽  
Critical Plane Approach ◽  
Guyed Mast

This paper proposes a new method for assessing the degree of the cumulative fatigue crack initiation damage of the joint welds at the guyed mast earplate. Based on the multi-scale wind-induced stress analysis of the guyed mast earplate joint, and considering the welding residual stress in earplate joint, the critical plane approach is used for the calculation of cumulative strain fatigue damage due to the combined actions of the welding residual stress and the wind load.

scholarly journals Multi-scale characterization of material and surface integrity of Inconel 718 when milling by Abrasive Water Jet process: Context of repair application

2021 ◽  
Author(s):  
Lorena Cano Salinas ◽  
Kamel Moussaoui ◽  
Akshay Hejjaji ◽  
Mehdi Salem ◽  
Anis Hor ◽  
...  
Keyword(s):  
Residual Stress ◽  
Material Removal ◽  
Traverse Speed ◽  
Grit Size ◽  
Depth Of Cut ◽  
Abrasive Water Jet ◽  
Multi Scale ◽  
Scale Characterization ◽  
Step Over

Inconel 718 (IN718) is a precipitation hardened nickel-base super-alloy exhibiting poor machinability and used in the hot section of aircraft engines. These components are subjected to severe thermo-mechanical loads in a highly corrosive environment, limiting their service life due to cracks and wear. Due to their high added-value, repair of damaged IN718 components is an interesting alternative instead their replacement. Repair process involves material removal of the damaged zone and subsequent cavity refill. Nevertheless, material removal of IN718 by conventional methods is a challenging task. Abrasive Water Jet (AWJ), a non-conventional machining process, offers a potential alternative to mitigate IN718 machining problems. However, research on the impact of AWJ process parameters during IN718 milling on the surface and material integrity is limited in the literature. Furthermore, in repair context, no study proposes AWJ machining as material removal process. The present work focuses on a multi-scale characterization of the influence of AWJ process parameters (pressure, traverse speed, step-over distance and abrasive size) on surface roughness, depth of cut, abrasive embedment and residual stress, during milling of untreated IN718. Surface integrity characterization on the milled surfaces was conducted through 3D optical microscopy, profilometry and SEM techniques. Residual stress measurements were performed in longitudinal and transverse directions with respect to the machining path using XRD technique. The results showed that all milled surfaces presented abrasive embedment and a compressive residual stress state with similar values in both directions. Up to 15% of the area of a milled surface consisted of abrasive embedment. The tool path has not influenced the residual stresses. Furthermore, surface roughness is dependent on pressure and traverse speed; depth of cut is influenced by pressure, traverse speed and grit size; abrasive embedment depends on pressure, step-over distance and grit size; whilst, residual stresses are influenced by traverse speed and grit size.

Process modeling and characterization of thermoset composites for residual stress prediction

2021 ◽  
pp. 1-12
Author(s):  
Sagar P. Shah ◽  
Sagar U. Patil ◽  
Christopher J. Hansen ◽  
Gregory M. Odegard ◽  
Marianna Maiarù
Keyword(s):  
Residual Stress ◽  
Process Modeling ◽  
Thermoset Composites ◽  
Stress Prediction

Prediction of SCC Initiation in Weld Components by Multi-Scale Analysis Incorporating Crystal Plasticity

2010 ◽  
Author(s):  
Masahito Mochizuki ◽  
Yoshiki Mikami
Keyword(s):  
Residual Stress ◽  
Crystal Orientation ◽  
Microscopic Model ◽  
Macroscopic Model ◽  
Scale Analysis ◽  
Analysis Method ◽  
Multi Scale ◽  
Microscopic Models ◽  
Multi Scale Analysis ◽  
Good Agreement

A multi-scale analysis method of microscopic stress is proposed to predict the occurrence of stress corrosion cracking (SCC) in the welded components in power plants. The method includes a macroscopic model and microscopic models. Calculation of the stress was first performed in the macroscopic model. Subsequent to this calculation, simulation of the microscopic model was conducted to evaluate the microscopic stress on the scale of the grains and microstructure. Then, the nodal temperatures and nodal displacements were transferred from the macroscopic model to the microscopic model as boundary conditions. The proposed multi-scale analysis was used to evaluate the weld residual stress of a bead-on-plate weld model to demonstrate the validity of the method. Good agreement was obtained between the macroscopic and microscopic models in nodal temperature, nodal displacement, and in the residual stress distribution. Following the bead-on-plate model, the multi-scale analysis method was applied to the model of an SCC test specimen of type 600 Nickel-based alloy. Crystal plasticity and inhomogeneous grain shapes were introduced into the microscopic model to consider the effect of crystal orientation. The crystal orientation was measured by electron backscattering pattern (EBSP) technique and applied to the microscopic model. The stress concentration at the grain boundaries was shown by the multi-scale analysis. In the simulated SCC tests, cracks were observed in the grain boundaries. The locations where microscopic stress concentrations occurred in the multi-scale analysis were in good agreement with the locations of cracks observed in the SCC test. The proposed multi-scale analysis method of microscopic stress distribution is thus applicable to the prediction of the locations of stress corrosion cracks.

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