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Research Papers: Design and Analysis

Thermal Elastic-Plastic Analysis Considering Temperature Rise by Rapid Plastic Deformation in Undermatched Joints

[+] Author and Article Information
Masahito Mochizuki, Gyu-Baek An, Masao Toyoda

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan

J. Pressure Vessel Technol 131(3), 031202 (Feb 04, 2009) (9 pages) doi:10.1115/1.3027477 History: Received November 12, 2006; Revised June 22, 2008; Published February 04, 2009

The characteristics of dynamic strength and fracture in structural steels and their welded joints particularly for pipelines should be evaluated based on the effects of the strain rate and service temperature. The temperature, however, rises so rapidly in structures due to the plastic work under the high strain rate such as ground sliding by earthquake when the effect of the temperature cannot be negligible for the dynamic fracture. It is difficult to predict or measure the temperature rise history with the corresponding stress-strain behavior, including the region beyond the uniform elongation, though the behavior at the large strain region after the maximum loading point is very important for the evaluation of fracture. In this paper, the coupling phenomena of the temperature and stress-strain fields under dynamic loading were simulated by using the finite element method. A modified rate-temperature parameter was defined by accounting for the effect of the temperature rise under rapid plastic deformation, and it was applied to the fully coupled analysis between the heat conduction and thermal elastic-plastic behavior. The temperature rise and stress-strain behavior, including the coupling phenomena, were studied including the region beyond the maximum loading point in structural steels and their undermatched joints, and then compared with the measured values.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of round-bar tension specimens of the homogeneous specimen and undermatched joint and definition of relative thickness. (a) Homogeneous specimen (HT50 and HT80 steels), (b) undermatched joint, and (c) relative thickness change of undermatched joint.

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Figure 2

Schematic of the round-bar tension test

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Figure 3

Examples of nominal stress-nominal strain curves obtained by round-bar tension test on static loading at a rate of 0.1mm∕s and dynamic loading at a rate of 100mm∕s

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Figure 4

Effects of strain rate and temperature on yield stress and tensile strength. (a) HT50 steel and (b) HT80 steel.

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Figure 5

Effects of strain rate and temperature on uniform elongation and elongation. (a) HT50 steel and (b) HT80 steel.

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Figure 6

Effects of strain rate and temperature on reduction in area. (a) HT50 steel and (b) HT80 steel.

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Figure 7

Characterization of yield stress using rate-temperature parameter R. (a) HT50 steel and (b) HT80 steel.

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Figure 8

Characterization of tensile strength using the modified rate-temperature parameter R (considering the temperature rise by dynamic loading). (a) HT50 steel and (b) HT80 steel.

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Figure 9

Mesh of the round-bar tension specimen for the heat-stress coupling finite element analysis

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Figure 10

Examples of the relation between the equivalent stress and equivalent plastic strain at each service temperature and each strain rate for finite element analysis in HT50 steel. (a) Strain rate ε̇=0.0025 and (b) strain rate ε̇=2.5.

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Figure 11

Comparison of stress-strain curves and temperature rise in round-bar tension specimen of HT50 and HT80 steels obtained by experiment and finite element analysis. (a) HT50 steel (0.01mm∕s at RT), (b) HT50 steel (100mm∕s at RT), (c) HT80 steel (0.01mm∕s at RT), and (d) HT80 steel (100mm∕s at RT).

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Figure 12

Comparison of stress-strain curves and temperature rise in round-bar tension specimen of undermatched joints obtained by experiment and finite element analysis. (a) X=0.15 (0.1mm∕s at RT), (b) X=0.15 (100mm∕s at RT), (c) X=1.0 (0.1mm∕s at −40°C), and (d) X=1.0 (100mm∕s at −40°C).

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Figure 13

Comparison of the necking behavior of an undermatched joint obtained by experiment and finite element analysis. (a) X=0.15 (100mm∕s at RT), (b) X=0.3 (100mm∕s at RT), and (c) X=1.0 (100mm∕s at RT).

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