Simulation of the Lattice Strains Developed during a Tensile Test on a Multiphase Steel

2005 ◽  
Vol 495-497 ◽  
pp. 1627-1632 ◽  
Author(s):  
Laurent Delannay ◽  
M. Melchior ◽  
Pascal J. Jacques ◽  
Paul van Houtte
Keyword(s):  
Tensile Test ◽  
Crystal Plasticity ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Element Mesh ◽  
Tensile Direction ◽  
Lattice Strains ◽  
Crystal Plasticity Theory ◽  
Two Phases ◽  
Multiphase Steel

This work investigates the micro-mechanics of a multiphase steel sheet during a uniaxial tensile test. Based on crystal plasticity theory, one assesses how the distribution of strain and stress is influenced by the presence of a soft b.c.c. phase and a strong f.c.c. phase. The two phases have been characterized by neutron diffraction. Initial textures are used as input in crystal plasticity simulations. Lattice strains measured in the tensile direction serve to fit hardening parameters. Three modeling hypotheses are tested: the Taylor model assumes uniform strain, the ALAMEL model considers the interaction of pairs of adjacent grains, and a finite element mesh is used to distribute strain and stress over the complete aggregate. The accuracy of each modeling is evaluated based on experimental measurements of the macroscopic stress, the heterogeneity of plastic strain, and the texture development in the two phases.

An innovation in finite element simulation via crystal plasticity assessment of grain morphology effect on sheet metal formability

2021 ◽  
pp. 146442072110246
Author(s):  
Mostafa Habibi ◽  
Roya Darabi ◽  
Jose C de Sa ◽  
Ana Reis
Keyword(s):  
Finite Element ◽  
Tensile Test ◽  
Crystal Plasticity ◽  
Forming Limit Diagram ◽  
Material Behavior ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Polycrystal Plasticity ◽  
Grain Distribution

Experimental and numerical study regarding the uniaxial tensile test and the forming limit diagram are addressed in this paper for AL2024 with the face-centered cube structure. First, representation of a grain structure can be obtained directly by mapping metallographic observations via scanning electron microscopy approach. Artificial grain microstructures produced by Voronoi Tessellation method are employed in the model using VGRAIN software. By resorting to the finite element software (ABAQUS) capabilities, the constitutive equations of the crystal plasticity were utilized and implemented as a user subroutine material UMAT code. The hardening parameters were calibrated by a trial and error approach in order to fit experimental tensile results with the simulation. Then the effect of the changing grain size, the heterogeneity factor, and the grain aspect ratio were studied for a uniaxial tensile test to emphasize the importance of the microstudy behavior of grains in material behavior. Furthermore, the polycrystal plasticity grain distribution was employed in the Nakazima test in order to obtain the forming limit diagram. The crystal plasticity-driven forming limit diagram reveals more accurate strains, taking into account the involving the micromechanical features of the grains. An innovative approach is pursued in this study to discover the necking angle, both in tensile test or Nakazima samples, showing a good agreement with the experiment results.

In situ lattice strains analysis in titanium during a uniaxial tensile test

2016 ◽  
Vol 662 ◽  
pp. 395-403 ◽  
Author(s):  
D. Gloaguen ◽  
B. Girault ◽  
J. Fajoui ◽  
V. Klosek ◽  
M.-J. Moya
Keyword(s):  
Tensile Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Lattice Strains

Design and development of aluminum alloy 6061-T6 pressure vessel liner for aerospace applications: A technical brief

2021 ◽  
pp. 146442072110651
Author(s):  
R Pramod ◽  
N Siva Shanmugam ◽  
C K Krishnadasan ◽  
G Radhakrishnan ◽  
Manu Thomas
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Weld Metal ◽  
Tensile Test ◽  
Pressure Vessel ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Aluminum Alloy 6061 ◽  
Custom Made ◽  
Alloy 6061

This work mainly focuses on designing a novel aluminum alloy 6061-T6 pressure vessel liner intended for use in launch vehicles. Fabrication of custom-made welding fixtures for the assembly of liner parts, namely two hemispherical domes and end boss, is illustrated. The parts of the liner are joined using the cold metal transfer welding process, and the welding trials are performed to arrive at an optimized parametric range. The metallurgical characterization of weld joint reveals the existence of dendritic structures (equiaxed and columnar). Microhardness of base and weld metal was 70 and 65 HV, respectively. The tensile strength of base and weld metal was 290 and 197 MPa, respectively, yielding a joint efficiency of 68%. Finite-element analysis of a uniaxial tensile test was performed to predict the tensile strength and location of the fracture in base and weld metal. The experimental and predicted tensile test results were found to be in good agreement.

Effect of multiple matrix cracking on crack bridging of fiber reinforced engineered cementitious composite

2020 ◽  
Vol 54 (26) ◽  
pp. 3949-3965 ◽  
Author(s):  
Xuan Zheng ◽  
Jun Zhang ◽  
Zhenbo Wang
Keyword(s):  
Tensile Test ◽  
Crack Spacing ◽  
Matrix Cracking ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Cementitious Composite ◽  
Fiber Reinforced ◽  
Crack Bridging ◽  
Engineered Cementitious Composite ◽  
Fiber Bridging

In the present paper, a modified micromechanics based model that describes the crack bridging stress in randomly oriented discontinuous fiber reinforced engineered cementitious composite is developed. In the model, effect of multiple matrix cracking on fiber embedded length, which in turn influencing fiber bridging in the composite, is taken into consideration. First, crack spacing of high strength-low shrinkage engineered cementitious composite was experimentally determined by photographing the specimen surface at some given loading points during uniaxial tensile test. The diagram of average cracking spacing and loading time of each composite is obtained based on above data. Then, fiber bridging model is modified by introducing a revised fiber embedment length as a function of crack spacing. The model is verified with uniaxial tensile test on both tensile strength and crack opening. Good agreement between model and test results is obtained. The modified model can be used in design and prediction of tensile properties of fiber reinforced cementitious composites with characteristics of multiple matrix cracking.

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