scholarly journals Effect of Weld Properties on the Crush Strength of the PWR Spacer Grid

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Kee-nam Song ◽  
Sang-hoon Lee
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Structural Component ◽  
Weld Zone ◽  
Base Material ◽  
Instrumented Indentation ◽  
Spacer Grid ◽  
Indentation Technique ◽  
Weld Properties ◽  
Crush Strength

Mechanical properties in a weld zone are different from those in the base material because of different microstructures. A spacer grid in PWR fuel is a structural component with an interconnected and welded array of slotted grid straps. Previous research on the strength analyses of the spacer grid was performed using base material properties owing to a lack of mechanical properties in the weld zone. In this study, based on the mechanical properties in the weld zone of the spacer grid recently obtained by an instrumented indentation technique, the strength analyses considering the mechanical properties in the weld zone were performed, and the analysis results were compared with the previous research.

Measurement of Weld Mechanical Properties Using an Instrumented Indentation Technique

2017 ◽  
Vol 754 ◽  
pp. 383-386
Author(s):  
Kee Nam Song
Keyword(s):  
Mechanical Properties ◽  
Heat Affected Zone ◽  
Weld Zone ◽  
Base Material ◽  
Metal Structure ◽  
Instrumented Indentation ◽  
Welded Structures ◽  
Indentation Technique ◽  
Lower Confidence ◽  
Welded Structure

Different microstructures in the weld zone of a metal structure including a fusion zone and a heat affected zone, are formed as compared to the base material. Consequently, the mechanical properties in the weld zone are different from those in the base material to a certain degree owing to different microstructures and residual welding stresses. When a welded structure is loaded, the mechanical behavior of the welded structure might be different from the case of a structure with homogeneous mechanical properties. It is known that obtaining the mechanical properties in the weld is generally difficult owing to the narrow regions of the weld and interfaces. As an alternative way to obtain the weld mechanical properties, the weld mechanical properties of Alloy800HT, SUS316L, and Alloy617, were recently measured using an instrumented indentation technique, and the representative weld mechanical properties of these materials were estimated with a 95% lower confidence level for later structural analyses of the welded structures.

scholarly journals Thermostructural Analysis of Plate-Type Heat Exchanger Prototypes Considering Weld Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-12
Author(s):  
Kee-nam Song ◽  
Sung-deok Hong
Keyword(s):  
Mechanical Properties ◽  
Heat Exchanger ◽  
Material Properties ◽  
Structural Integrity ◽  
Weld Zone ◽  
Parent Material ◽  
Small Scale ◽  
Hastelloy X ◽  
Weld Properties ◽  
Plate Type

The mechanical properties in a weld zone are different from those in the parent material owing to their different microstructures and residual weld stresses. Welded plate-type heat exchanger prototypes made of Hastelloy-X alloy were manufactured, and performance tests on the prototypes were performed in a small-scale nitrogen gas loop at the Korea Atomic Energy Research Institute. Owing to a lack of mechanical properties in the weld zone, previous research on the strength analyses of the prototypes was performed using the parent material properties. In this study, based on the mechanical properties of Hastelloy-X alloy obtained using an instrumented indentation technique, strength analyses considering the mechanical properties in the weld zone were performed, and the analysis results were compared with previous research. As a result of the comparison, a thermostructural analysis considering the weld material properties is needed to understand the structural behavior and evaluate the structural integrity of the prototype more reliably.

Parametric Study of EAPap Material Properties

2012 ◽  
Vol 430-432 ◽  
pp. 242-246
Author(s):  
Li Jie Zhao ◽  
Qiang Fu
Keyword(s):  
Mechanical Properties ◽  
Bifurcation Point ◽  
Environmental Conditions ◽  
Smart Materials ◽  
Material Properties ◽  
Parametric Study ◽  
Anisotropic Material ◽  
Base Material ◽  
Electrical Field ◽  
Plastic Modulus

Cellulose paper is used as base material for so-called electroactive papers (EAPap) actuator. EAPap is a complex anisotropic material, which has not been extensively characterized and additional basic testing is required before developing application devices from EAPap. Mechanical properties of EAPap were investigated in this work under different environmental conditions (humidity, temperature, and electrical field) and configurations. It shows viscoelastic effect and exhibits two distinct elastic and plastic modulus connected by a bifurcation point. Through tests, environment and configuration effects on EAPap are obtained to researchers and designers interested in the field of smart materials and EAP.

scholarly journals Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

2019 ◽  
Vol 13 (3) ◽  
pp. 104-112
Author(s):  
Pham Thai Hoan ◽  
Nguyen Ngoc Vinh ◽  
Nguyen Thi Thanh Tung
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Strain Rate ◽  
Structural Steel ◽  
Weld Zone ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Steel Weld ◽  
Instrumented Indentation ◽  
Indentation Tests

In this study, instrumented indentation testing was conducted at room temperature for the investigation of the effect of strain rate on the hardness and yield strength in the weld zone of a commonly used structural steel, SM520. A number of indentation tests were undertaken at a number of strain rate values from 0.02 s-1 to 0.2 s-1 in the weld metal (WM), heat-affected zone (HAZ), and base metal (BM) regions of the weld zone. The mechanical properties including yield strength (σy) and hardness (H) in WM, HAZ, and BM were then computed from the applied load-penetration depth curves using a proposed method. As the result, the effects of strain rate indentation on yield strength and hardness in all regions of the weld zone were evaluated. The results displayed that hardness and yield strength in the weld zone’s components are influenced on the strain rate, where both hardness and yield strength decrease with the decreasing strain rate. Keywords: indentation; mechanical properties; strain rate effect; structural steel; weld zone.

Study on the Microstructure and the Mechanical Properties of TA2

2012 ◽  
Vol 472-475 ◽  
pp. 2655-2658
Author(s):  
Xiao Dong Hu ◽  
Sen Zhang ◽  
Yong Zhang ◽  
Ya Jiang Li
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Arc Welding ◽  
Weld Zone ◽  
Base Material ◽  
Annealing Treatment ◽  
Welding Joint

The microstructure and the mechanical properties of welding joint with the material of TA2 have been studied in this paper with the specimens made with the method of argon-arc welding. The microhardness of the welding joint has been compared with the hardness in the same position of the weld joint after annealing. Conclusions have been obtained as follows: The organizations of the welding joint include base material, recrystallization zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as M-shape with the softest point located at the center, and the hardest is located at the overheated zone; the annealing treatment can enhance the weld joint hardness mainly at the center, and the hardness of other zones change little.

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