Simplified measurement of the strain to fracture for plane strain tension: On the use of 2D DIC for dual hole plane strain tension mini Nakazima specimens with dihedral punch
A plane-strain-tension stress state leads to a minimum in ductility in most micro-mechanical and phenomenological fracture models as well as Forming Limit Curves. Hence, this stress state plays a crucial role in many applications and a reliable measurement of the strain to fracture under plane strai...
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creator | Adlafi, M. Galpin, B. Mahéo, L. Roth, C. C. Mohr, D. Grolleau, V. |
description | A plane-strain-tension stress state leads to a minimum in ductility in most micro-mechanical and phenomenological fracture models as well as Forming Limit Curves. Hence, this stress state plays a crucial role in many applications and a reliable measurement of the strain to fracture under plane strain tension is of particular importance when calibrating modern fracture initiation models. Recently, a new experimental technique has been proposed for measuring the strain to fracture for sheet metal after proportional loading under plane strain conditions. The basic configuration of the novel setup includes a dihedral punch applying out-of-plane loading onto a Nakazima-type disc-shaped specimen with two symmetric circular cut-outs. 3D Digital Image Correlation (DIC) is used to measure the surface strains of the specimen up to fracture. In contrast to the widely used V-Bending test, the maximum obtainable strain is not limited when using this set up, and fracture will always initiate after proportional loading in a plane strain tension stress state. In the present study, a major simplification of the testing methodology is proposed, reducing from 3D DIC to a simple 2D DIC method for measuring the fracture strain. Comparisons are presented on three metals, a 1.5 mm thick DP600 steel, a 0.8 mm thick DP450 steel and a 1.2 mm thick AA2024 aluminum alloy. |
doi_str_mv | 10.1088/1757-899X/1157/1/012058 |
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The basic configuration of the novel setup includes a dihedral punch applying out-of-plane loading onto a Nakazima-type disc-shaped specimen with two symmetric circular cut-outs. 3D Digital Image Correlation (DIC) is used to measure the surface strains of the specimen up to fracture. In contrast to the widely used V-Bending test, the maximum obtainable strain is not limited when using this set up, and fracture will always initiate after proportional loading in a plane strain tension stress state. In the present study, a major simplification of the testing methodology is proposed, reducing from 3D DIC to a simple 2D DIC method for measuring the fracture strain. Comparisons are presented on three metals, a 1.5 mm thick DP600 steel, a 0.8 mm thick DP450 steel and a 1.2 mm thick AA2024 aluminum alloy.</description><identifier>ISSN: 1757-8981</identifier><identifier>EISSN: 1757-899X</identifier><identifier>DOI: 10.1088/1757-899X/1157/1/012058</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Aluminum base alloys ; Crack initiation ; Digital imaging ; Forming limit diagrams ; Fracture mechanics ; Measurement methods ; Metal sheets ; Plane strain ; Stress state</subject><ispartof>IOP conference series. Materials Science and Engineering, 2021-06, Vol.1157 (1), p.12058</ispartof><rights>Published under licence by IOP Publishing Ltd</rights><rights>2021. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). 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C.</creatorcontrib><creatorcontrib>Mohr, D.</creatorcontrib><creatorcontrib>Grolleau, V.</creatorcontrib><title>Simplified measurement of the strain to fracture for plane strain tension: On the use of 2D DIC for dual hole plane strain tension mini Nakazima specimens with dihedral punch</title><title>IOP conference series. Materials Science and Engineering</title><addtitle>IOP Conf. Ser.: Mater. Sci. Eng</addtitle><description>A plane-strain-tension stress state leads to a minimum in ductility in most micro-mechanical and phenomenological fracture models as well as Forming Limit Curves. Hence, this stress state plays a crucial role in many applications and a reliable measurement of the strain to fracture under plane strain tension is of particular importance when calibrating modern fracture initiation models. Recently, a new experimental technique has been proposed for measuring the strain to fracture for sheet metal after proportional loading under plane strain conditions. The basic configuration of the novel setup includes a dihedral punch applying out-of-plane loading onto a Nakazima-type disc-shaped specimen with two symmetric circular cut-outs. 3D Digital Image Correlation (DIC) is used to measure the surface strains of the specimen up to fracture. In contrast to the widely used V-Bending test, the maximum obtainable strain is not limited when using this set up, and fracture will always initiate after proportional loading in a plane strain tension stress state. In the present study, a major simplification of the testing methodology is proposed, reducing from 3D DIC to a simple 2D DIC method for measuring the fracture strain. Comparisons are presented on three metals, a 1.5 mm thick DP600 steel, a 0.8 mm thick DP450 steel and a 1.2 mm thick AA2024 aluminum alloy.</description><subject>Aluminum base alloys</subject><subject>Crack initiation</subject><subject>Digital imaging</subject><subject>Forming limit diagrams</subject><subject>Fracture mechanics</subject><subject>Measurement methods</subject><subject>Metal sheets</subject><subject>Plane strain</subject><subject>Stress state</subject><issn>1757-8981</issn><issn>1757-899X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqFkc1KxDAUhYsoOI4-gwFXLsbmpzWtOxnHH1BnoYK7EJsbmrFNatIi-lA-o-1UFEFwlcA538m9OVG0T_ARwVkWE57yWZbnjzEhKY9JjAnFabYRTb6Vze97RrajnRBWGB_zJMGT6OPO1E1ltAGFapCh81CDbZHTqC0BhdZLY1HrkPayaHsVaedRU0n7I4INxtkTtLRrpgsw4PQMnV3N13bVyQqVroI_QVQba9CtfJbvppYoNFCYfoaAXk1bImVKUL7nm84W5W60pWUVYO_rnEYP54v7-eXsenlxNT-9nhUsoe1M8UwxBsAAs4ITzGhSUCxVnuMnpTFOgUiilEpzxaksUqqBScUozyF9kgmwaXQw5jbevXQQWrFynbf9k4KmCePHjOWkd_HRVXgXggctGt-v4N8EwWIoRwzfLoYKxFCOIGIspyfZSBrX_ET_Tx3-Qd3cLX77RKM0-wQoEKI9</recordid><startdate>20210601</startdate><enddate>20210601</enddate><creator>Adlafi, M.</creator><creator>Galpin, B.</creator><creator>Mahéo, L.</creator><creator>Roth, C. 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Hence, this stress state plays a crucial role in many applications and a reliable measurement of the strain to fracture under plane strain tension is of particular importance when calibrating modern fracture initiation models. Recently, a new experimental technique has been proposed for measuring the strain to fracture for sheet metal after proportional loading under plane strain conditions. The basic configuration of the novel setup includes a dihedral punch applying out-of-plane loading onto a Nakazima-type disc-shaped specimen with two symmetric circular cut-outs. 3D Digital Image Correlation (DIC) is used to measure the surface strains of the specimen up to fracture. In contrast to the widely used V-Bending test, the maximum obtainable strain is not limited when using this set up, and fracture will always initiate after proportional loading in a plane strain tension stress state. In the present study, a major simplification of the testing methodology is proposed, reducing from 3D DIC to a simple 2D DIC method for measuring the fracture strain. Comparisons are presented on three metals, a 1.5 mm thick DP600 steel, a 0.8 mm thick DP450 steel and a 1.2 mm thick AA2024 aluminum alloy.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1757-899X/1157/1/012058</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Aluminum base alloys Crack initiation Digital imaging Forming limit diagrams Fracture mechanics Measurement methods Metal sheets Plane strain Stress state |
title | Simplified measurement of the strain to fracture for plane strain tension: On the use of 2D DIC for dual hole plane strain tension mini Nakazima specimens with dihedral punch |
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