Numerical prediction of residual stresses and birefringence in injection/compression molded center-gated disk. Part II: Effects of processing conditions

2002 ◽  
Vol 42 (11) ◽  
pp. 2273-2292 ◽  
Author(s):  
Young Bok Lee ◽  
Tai Hun Kwon ◽  
Kyunghwan Yoon
Keyword(s):  
Residual Stresses ◽  
Numerical Prediction ◽  
Processing Conditions

A contribution to numerical prediction of surface damage and residual stresses on die-sinking EDM of Ti6Al4V

2021 ◽  
Vol 68 ◽  
pp. 1458-1484
Author(s):  
Wajdi Rajhi ◽  
Ibrahim Alatawi ◽  
Tayyab Subhani ◽  
Badreddine Ayadi ◽  
Abdulaziz Al-Ghamdi ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Surface Damage ◽  
Numerical Prediction

Standardisation on Measurement and Interpretation of Residual Stress Data

2019 ◽  
Author(s):  
Ali Mirzaee-Sisan ◽  
P. John Bouchard ◽  
Foroogh Hosseinzadeh
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Practice Guidelines ◽  
Structural Integrity ◽  
Good Practice ◽  
Critical Assessment ◽  
Numerical Prediction ◽  
Specific Technique ◽  
Integrity Assessment

Abstract This paper highlights many unanswered questions relating to the characterisation of residual stresses in weldments and their treatment in engineering critical assessment and fitness for service assessment codes and standards. The need for an overarching standardisation framework is identified which goes beyond developing good practice guidelines for numerical prediction or measurement using a specific technique. The framework should cover all uncertainties and possible errors in measuring, simulating and interpreting residual stress in the context of structural integrity assessment.

scholarly journals Fatigue Fracture Properties and Morphology of Polyoxymethylene (POM) Plates Produced under Moderate Processing Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
M. Berer ◽  
M. Halb ◽  
M. Feuchter ◽  
G. Pacher ◽  
G. Pinter
Keyword(s):  
Injection Molding ◽  
Residual Stresses ◽  
Fatigue Fracture ◽  
Hierarchical Structure ◽  
Strong Dependence ◽  
Combined Effect ◽  
The Other ◽  
Processing Conditions ◽  
Fracture Properties ◽  
Fracture Performance

The present study was inspired by different industry projects in which a strong dependence of the fatigue fracture performance of POM on the processing conditions was observed. To examine the relationships under more reproducible conditions, plates of two different POM homopolymer resins (one significantly nucleated) were produced by compression molding and by injection molding under moderate conditions. For the injection molding, three different mold temperatures were used. At specific locations, the plates were analyzed concerning their hierarchical structure on the micro- and nanolevel and concerning their fatigue fracture performance. For the fatigue fracture performance, the dependence on the processing conditions was rather small for the nucleated resin but much more significant for the other resins. This dependence could not be related to morphological effects only, and thus, a combined effect of morphology and residual stresses was assumed.

Processing Optimization of Optical Lens in the Injection Molding

2013 ◽  
Vol 813 ◽  
pp. 161-164 ◽  
Author(s):  
Chao Ming Lin ◽  
Chih Kun Wang
Keyword(s):  
Residual Stress ◽  
Refractive Index ◽  
Residual Stresses ◽  
Processing Parameters ◽  
Processing Conditions ◽  
Fringe Order ◽  
Optimal Method ◽  
Optical Lens ◽  
Injection Molded ◽  
Processing Optimization

The processing conditions during the manufacturing have critical effects on the optical performances of the molded lenses including the refractive index, isochromatic fringe order, and the fringed pattern. The objective of this work is to investigate numerically some effects of the molding conditions on the residual stresses of injection molded lenses, and then to optimal the processing parameters for reducing the residual stresses using the Taguchi method. The results show the optimal method is able to improve the residual stress and to produce a good fringed pattern.

Residual Stresses and Workpiece Deformation Due to Polishing and Plating of Computer Hard Disk Substrates

1999 ◽  
Vol 121 (1) ◽  
pp. 32-40 ◽  
Author(s):  
B. E. Klamecki
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Residual Stresses ◽  
Processing Conditions ◽  
Bending Moments ◽  
Stress Distributions ◽  
Material Deformation ◽  
Removal Processes ◽  
Insight Into ◽  
Shape Data

Residual stress distributions due to plating and polishing were determined for nickel-phosphorus plated aluminum alloy disks. Knowledge of these stresses provides insight into the material deformation and removal processes, information as to the effects of processing conditions on residual stress magnitude and can also serve as a basis for development of models of material deformation and removal in polishing. Measured disk shape data was fitted to an analytical solution for plate displacement due to bending moments, and residual stresses were calculated. Plating and polishing residual stresses were separated. Polishing residual stress is compressive indicating differential plastic deformation between the surface and interior regions of the workpiece. Residual stresses produced in polishing operations in which process motions were constrained so that polishing was unidirectional were measured. The results show large differences between amounts of deformation in the polishing direction and the direction perpendicular to it.

Carbides

Carburizing ◽  
1999 ◽  
pp. 51-75
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Residual Stresses ◽  
Alloying Elements ◽  
Processing Conditions ◽  
Carbide Phases ◽  
Composition And Structure ◽  
Fracture Behaviors ◽  
Fatigue And Fracture ◽  
Carburizing Process

Abstract This chapter discusses the formation of free carbides and their effect on case-carburized components. It explains how alloying elements influence the composition and structure of carbide phases produced at cooling rates typical of carburizing process. It describes the morphology and distribution of the various types of carbides formed and explains how they affect mechanical properties such as hardness, residual stresses, fatigue and fracture behaviors, and wear resistance. It also provides guidance for determining what processing conditions to avoid and when and why parts should be rejected.

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