A REVISED FORM FOR THE JOHNSON–COOK STRENGTH MODEL
Strength models play a key role in the numerical simulation of impact events. A revised form of the Johnson–Cook strength model is proposed in this paper. The revised model treats the sudden strengthening that many ductile metals exhibit at strain rates greater than 10 4/s. Strain rates of this magn...
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| Veröffentlicht in: | International journal of impact engineering 1998-09, Vol.21 (8), p.609-624 |
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| container_title | International journal of impact engineering |
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| creator | RULE, WILLIAM K. Jones, S.E. |
| description | Strength models play a key role in the numerical simulation of impact events. A revised form of the Johnson–Cook strength model is proposed in this paper. The revised model treats the sudden strengthening that many ductile metals exhibit at strain rates greater than 10
4/s. Strain rates of this magnitude are generally considered to be beyond the capability of the split-Hopkinson pressure bar and so such abrupt strengthening behavior is often not observed and reported. A method to economically estimate all eight coefficients of the revised strength model using quasi-static tension data and Taylor impact test data reduced with a modified version of the EPIC finite element code is also described. Revised strength model coefficients were determined for: 7075-T6 aluminum, OFHC copper, wrought iron, and a high-strength steel (Astralloy-V
®). A good fit to the quasi-static tension data and Taylor impact test results was obtained for these four different metals. The behavior of the revised strength model at high strain rates also compared favorably with independent predictions from an analytical model calibrated with the Taylor impact data. |
| doi_str_mv | 10.1016/S0734-743X(97)00081-X |
| format | Article |
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4/s. Strain rates of this magnitude are generally considered to be beyond the capability of the split-Hopkinson pressure bar and so such abrupt strengthening behavior is often not observed and reported. A method to economically estimate all eight coefficients of the revised strength model using quasi-static tension data and Taylor impact test data reduced with a modified version of the EPIC finite element code is also described. Revised strength model coefficients were determined for: 7075-T6 aluminum, OFHC copper, wrought iron, and a high-strength steel (Astralloy-V
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4/s. Strain rates of this magnitude are generally considered to be beyond the capability of the split-Hopkinson pressure bar and so such abrupt strengthening behavior is often not observed and reported. A method to economically estimate all eight coefficients of the revised strength model using quasi-static tension data and Taylor impact test data reduced with a modified version of the EPIC finite element code is also described. Revised strength model coefficients were determined for: 7075-T6 aluminum, OFHC copper, wrought iron, and a high-strength steel (Astralloy-V
®). A good fit to the quasi-static tension data and Taylor impact test results was obtained for these four different metals. The behavior of the revised strength model at high strain rates also compared favorably with independent predictions from an analytical model calibrated with the Taylor impact data.</description><subject>Applied sciences</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Deformation and plasticity (including yield, ductility, and superplasticity)</subject><subject>Elasticity. Plasticity</subject><subject>Exact sciences and technology</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Inelasticity (thermoplasticity, viscoplasticity...)</subject><subject>Mechanical and acoustical properties of condensed matter</subject><subject>Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology</subject><subject>Mechanical properties of solids</subject><subject>Metals. Metallurgy</subject><subject>Physics</subject><subject>Solid mechanics</subject><subject>Structural and continuum mechanics</subject><subject>Viscoelasticity, plasticity, viscoplasticity</subject><issn>0734-743X</issn><issn>1879-3509</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqFkMtOwkAUhidGExF9BJMujNFF9UxnptNZGQKFokATWg27yXQ6TWrKxQ6YuPMdfEOfRAqErZtzNt9_Lh9C1xgeMGD_MQFOqMspmd0Jfg8AAXZnJ6iFAy5cwkCcotYROUcX1r4DYA4MWoh2nGn4NkzCntOPp-OmOGkUOs9xNEniye_3TzeOX5wknYaTQRo547gXji7RWaEqa64OvY1e-2HajdxRPBh2OyNXE5-vXe1TiiHzCuwzD1NhoGABBCLXSgRgCsZzMCpTASF5RoXQPMgYEUxjrRgGQtrodj93VS8_Nsau5by02lSVWpjlxkrP5wSDB1uQ7UFdL62tTSFXdTlX9ZfEIBtHcudINgKk4HLnSM62uZvDAmW1qopaLXRpj2GPej71mjue9pjZPvtZmlpaXZqFNnlZG72W-bL8Z9Ef_ZJ2Lw</recordid><startdate>19980901</startdate><enddate>19980901</enddate><creator>RULE, WILLIAM K.</creator><creator>Jones, S.E.</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19980901</creationdate><title>A REVISED FORM FOR THE JOHNSON–COOK STRENGTH MODEL</title><author>RULE, WILLIAM K. ; Jones, S.E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c367t-c64410b2f1652149e0f58089dca980ef57d0eaba833db499c78b5395c1ca51033</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Applied sciences</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Deformation and plasticity (including yield, ductility, and superplasticity)</topic><topic>Elasticity. Plasticity</topic><topic>Exact sciences and technology</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Inelasticity (thermoplasticity, viscoplasticity...)</topic><topic>Mechanical and acoustical properties of condensed matter</topic><topic>Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology</topic><topic>Mechanical properties of solids</topic><topic>Metals. Metallurgy</topic><topic>Physics</topic><topic>Solid mechanics</topic><topic>Structural and continuum mechanics</topic><topic>Viscoelasticity, plasticity, viscoplasticity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>RULE, WILLIAM K.</creatorcontrib><creatorcontrib>Jones, S.E.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>International journal of impact engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>RULE, WILLIAM K.</au><au>Jones, S.E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A REVISED FORM FOR THE JOHNSON–COOK STRENGTH MODEL</atitle><jtitle>International journal of impact engineering</jtitle><date>1998-09-01</date><risdate>1998</risdate><volume>21</volume><issue>8</issue><spage>609</spage><epage>624</epage><pages>609-624</pages><issn>0734-743X</issn><eissn>1879-3509</eissn><coden>IJIED4</coden><abstract>Strength models play a key role in the numerical simulation of impact events. A revised form of the Johnson–Cook strength model is proposed in this paper. The revised model treats the sudden strengthening that many ductile metals exhibit at strain rates greater than 10
4/s. Strain rates of this magnitude are generally considered to be beyond the capability of the split-Hopkinson pressure bar and so such abrupt strengthening behavior is often not observed and reported. A method to economically estimate all eight coefficients of the revised strength model using quasi-static tension data and Taylor impact test data reduced with a modified version of the EPIC finite element code is also described. Revised strength model coefficients were determined for: 7075-T6 aluminum, OFHC copper, wrought iron, and a high-strength steel (Astralloy-V
®). A good fit to the quasi-static tension data and Taylor impact test results was obtained for these four different metals. The behavior of the revised strength model at high strain rates also compared favorably with independent predictions from an analytical model calibrated with the Taylor impact data.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0734-743X(97)00081-X</doi><tpages>16</tpages></addata></record> |
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| ispartof | International journal of impact engineering, 1998-09, Vol.21 (8), p.609-624 |
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| source | Elsevier ScienceDirect Journals Complete - AutoHoldings |
| subjects | Applied sciences Condensed matter: structure, mechanical and thermal properties Deformation and plasticity (including yield, ductility, and superplasticity) Elasticity. Plasticity Exact sciences and technology Fundamental areas of phenomenology (including applications) Inelasticity (thermoplasticity, viscoplasticity...) Mechanical and acoustical properties of condensed matter Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Mechanical properties of solids Metals. Metallurgy Physics Solid mechanics Structural and continuum mechanics Viscoelasticity, plasticity, viscoplasticity |
| title | A REVISED FORM FOR THE JOHNSON–COOK STRENGTH MODEL |
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