Finite Element Simulation on Small Punch Test for an Evaluation of J-integral for TRIP Steel

2018 ◽  
pp. 17-28
Author(s):  
H. T. Pham ◽  
T. Iwamoto
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Trip Steel ◽  
J Integral ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Element Simulation

Determination and Validation of Gurson-Tvergaard Model Parameters for Finite Element Simulation of Small Punch Test

2015 ◽  
Vol 750 ◽  
pp. 59-68 ◽  
Author(s):  
Yan Yan Lu ◽  
Liang Chen ◽  
Kai Shu Guan
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Model Parameters ◽  
Displacement Curve ◽  
Small Punch Test ◽  
Test Technique ◽  
Small Punch ◽  
Punch Test ◽  
Element Simulation ◽  
Load Displacement

Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method. Since the deformation behavior of the small punch specimen is complicated, finite element simulation embedded with Gurson-Tvergaard (GTN) model is adopted to simulate elastic-plastic behaviour until fracture. Choosing the proper GTN parameters is crucial for the small punch simulation, which directly influence the precision of load-displacement curve obtained from simulation. In this paper, load-displacement curve is divided into five stages and the parameters identification process is done by adjusting the simulation curve with experimental load-displacement curve in different stages which controlled by separately parameters. The results show that the parameters determined based on this criterion are not unique. In order to validate the reliability of this method, specimen’s minimum thickness of cross-section after fracture was introduced as an extra criterion which turned out to be feasible. Load-displacement curves cannot serve as the only criterion to verify the GTN parameters.

Determination of Material Fracture Toughness by Circular Pre-Cracked Small Punch Test Specimens

2019 ◽  
Vol 795 ◽  
pp. 165-171
Author(s):  
Wu Lin Wang ◽  
Du Wei Wang ◽  
Kai Shu Guan
Keyword(s):  
Fracture Toughness ◽  
Empirical Correlation ◽  
Fracture Toughness Test ◽  
J Integral ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Determination Procedure ◽  
Material Fracture

Fracture toughness empirical correlation between SPT(Small Punch Test) with non-crack sample and standard fracture toughness test has been established in recent years. In order to compensate the imperfection of empirical correlation, such as absence theoretical basis, poor repeatability and universality, in this paper, an O-type pre-cracked sample was adopted to evaluate fracture toughness. The mechanical model of the sample is in compliance with plane strain condition in the direction of crack propagation. In this paper a determination procedure was studied and established, and the J-integral of steel Q345R was calculated using the procedure.

Small punch test: An approach to solve the inverse problem by deformation shape and finite element optimization

2007 ◽  
Vol 40 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Patrick Egan ◽  
Maurice P. Whelan ◽  
Fereydoun Lakestani ◽  
Michael J. Connelly
Keyword(s):  
Inverse Problem ◽  
Finite Element ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

A STUDY ON IMPACT DEFORMATION AND TRANSFORMATION BEHAVIOR OF TRIP STEEL BY FINITE ELEMENT SIMULATION AND EXPERIMENT

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5985-5990 ◽  
Author(s):  
TAKESHI IWAMOTO ◽  
TOSHIYUKI SAWA ◽  
MOHAMMED CHERKAOUI
Keyword(s):  
Finite Element ◽  
Martensitic Transformation ◽  
Finite Element Simulation ◽  
Trip Steel ◽  
Deformation Behavior ◽  
Implicit Time ◽  
Transformation Behavior ◽  
Impact Deformation ◽  
Element Simulation ◽  
The Impact

Due to strain-induced martensitic transformation (SIMT), the strength, ductility and toughness of TRIP steel are enhanced. The impact deformation behavior of TRIP steel is very important because it is investigated to apply it for the shock absorption member in automobile industries. However, its behavior is still unclear since it is quite difficult to capture the transformation behavior inside the materials. There are some opinions that the deformation characteristics are not mainly depending on the martensitic transformation due to heat generation by plastic work. Here, the impact compressive deformation behavior of TRIP steel is experimentally studied by Split Hopkinson Pressure Bar (SHPB) method at room temperature. In order to catch SIMT behavior during impact deformation, volume resistivity is measured and a transient temperature is captured by using a quite thin thermocouple. Then, a finite element simulation with the constitutive model for TRIP steel is performed. The finite element equation can be derived from the rate form of principle of virtual work based on the implicit time integration scheme. Finally, the results between the computation and experiment are compared to confirm the validity of computational model.

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