Mechanical Response of Polycarbonate with Strength Model Fits
Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static...
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| creator | Dwivedi, Ajmer Bradley, Jermaine Casem, Daniel |
| description | Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static tests were conducted at strain rates between 0.005/s and 0.4/s using a servo-hydraulic load frame. Dynamic compression experiments were performed using the Split Hopkinson Pressure Bar and resulted in strain rates between 1750/s and 15,000/s. Pre-heated specimens were tested in both setups to determine the effects of thermal softening. The results indicate that the material response is rate sensitive with an enhanced hardening at rates greater than 10/s. Predictably, tests conducted at elevated temperatures cause a decrease in the apparent yield and flow stress. Model fits to the data are shown to provide a reasonable approximation of real world behavior.
The original document contains color images. |
| format | Report |
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The original document contains color images.</description><language>eng</language><subject>AMORPHOUS POLYMERS ; COMPRESSION ; DEFORMATION ; FLOW STRESS ; HARDENING ; HIGH TEMPERATURE ; KOLSKY BAR ; MECHANICAL PROPERTIES ; Mechanics ; Plastics ; POLYCARBONATES ; Polymer Chemistry ; POLYMER MODELING ; POLYMER POLYCARBONATE ; POLYMER TESTING ; RATE EFFECT ; ROOM TEMPERATURE ; STRAIN RATE ; STRENGTH(MECHANICS) ; TEMPERATURE EFFECT ; TENSILE TESTS ; TENSION ; THERMAL SOFTENING ; THERMOPLASTIC RESINS ; TRANSPARENT ARMOR ; TRANSPARENT MATERIALS ; UNIAXIAL STRESS ; YIELD</subject><creationdate>2012</creationdate><rights>Approved for public release; distribution is unlimited.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,776,881,27544,27545</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA566369$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Dwivedi, Ajmer</creatorcontrib><creatorcontrib>Bradley, Jermaine</creatorcontrib><creatorcontrib>Casem, Daniel</creatorcontrib><creatorcontrib>DYNAMIC SCIENCE INC ABERDEEN MD</creatorcontrib><title>Mechanical Response of Polycarbonate with Strength Model Fits</title><description>Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static tests were conducted at strain rates between 0.005/s and 0.4/s using a servo-hydraulic load frame. Dynamic compression experiments were performed using the Split Hopkinson Pressure Bar and resulted in strain rates between 1750/s and 15,000/s. Pre-heated specimens were tested in both setups to determine the effects of thermal softening. The results indicate that the material response is rate sensitive with an enhanced hardening at rates greater than 10/s. Predictably, tests conducted at elevated temperatures cause a decrease in the apparent yield and flow stress. Model fits to the data are shown to provide a reasonable approximation of real world behavior.
The original document contains color images.</description><subject>AMORPHOUS POLYMERS</subject><subject>COMPRESSION</subject><subject>DEFORMATION</subject><subject>FLOW STRESS</subject><subject>HARDENING</subject><subject>HIGH TEMPERATURE</subject><subject>KOLSKY BAR</subject><subject>MECHANICAL PROPERTIES</subject><subject>Mechanics</subject><subject>Plastics</subject><subject>POLYCARBONATES</subject><subject>Polymer Chemistry</subject><subject>POLYMER MODELING</subject><subject>POLYMER POLYCARBONATE</subject><subject>POLYMER TESTING</subject><subject>RATE EFFECT</subject><subject>ROOM TEMPERATURE</subject><subject>STRAIN RATE</subject><subject>STRENGTH(MECHANICS)</subject><subject>TEMPERATURE EFFECT</subject><subject>TENSILE TESTS</subject><subject>TENSION</subject><subject>THERMAL SOFTENING</subject><subject>THERMOPLASTIC RESINS</subject><subject>TRANSPARENT ARMOR</subject><subject>TRANSPARENT MATERIALS</subject><subject>UNIAXIAL STRESS</subject><subject>YIELD</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>2012</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNrjZLD1TU3OSMzLTE7MUQhKLS7IzytOVchPUwjIz6lMTixKys9LLElVKM8syVAILilKzUsHMnzzU1JzFNwyS4p5GFjTEnOKU3mhNDeDjJtriLOHbkpJZnJ8cUlmXmpJvKOLo6mZmbGZpTEBaQAx9y00</recordid><startdate>201202</startdate><enddate>201202</enddate><creator>Dwivedi, Ajmer</creator><creator>Bradley, Jermaine</creator><creator>Casem, Daniel</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>201202</creationdate><title>Mechanical Response of Polycarbonate with Strength Model Fits</title><author>Dwivedi, Ajmer ; Bradley, Jermaine ; Casem, Daniel</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA5663693</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>2012</creationdate><topic>AMORPHOUS POLYMERS</topic><topic>COMPRESSION</topic><topic>DEFORMATION</topic><topic>FLOW STRESS</topic><topic>HARDENING</topic><topic>HIGH TEMPERATURE</topic><topic>KOLSKY BAR</topic><topic>MECHANICAL PROPERTIES</topic><topic>Mechanics</topic><topic>Plastics</topic><topic>POLYCARBONATES</topic><topic>Polymer Chemistry</topic><topic>POLYMER MODELING</topic><topic>POLYMER POLYCARBONATE</topic><topic>POLYMER TESTING</topic><topic>RATE EFFECT</topic><topic>ROOM TEMPERATURE</topic><topic>STRAIN RATE</topic><topic>STRENGTH(MECHANICS)</topic><topic>TEMPERATURE EFFECT</topic><topic>TENSILE TESTS</topic><topic>TENSION</topic><topic>THERMAL SOFTENING</topic><topic>THERMOPLASTIC RESINS</topic><topic>TRANSPARENT ARMOR</topic><topic>TRANSPARENT MATERIALS</topic><topic>UNIAXIAL STRESS</topic><topic>YIELD</topic><toplevel>online_resources</toplevel><creatorcontrib>Dwivedi, Ajmer</creatorcontrib><creatorcontrib>Bradley, Jermaine</creatorcontrib><creatorcontrib>Casem, Daniel</creatorcontrib><creatorcontrib>DYNAMIC SCIENCE INC ABERDEEN MD</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Dwivedi, Ajmer</au><au>Bradley, Jermaine</au><au>Casem, Daniel</au><aucorp>DYNAMIC SCIENCE INC ABERDEEN MD</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Mechanical Response of Polycarbonate with Strength Model Fits</btitle><date>2012-02</date><risdate>2012</risdate><abstract>Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static tests were conducted at strain rates between 0.005/s and 0.4/s using a servo-hydraulic load frame. Dynamic compression experiments were performed using the Split Hopkinson Pressure Bar and resulted in strain rates between 1750/s and 15,000/s. Pre-heated specimens were tested in both setups to determine the effects of thermal softening. The results indicate that the material response is rate sensitive with an enhanced hardening at rates greater than 10/s. Predictably, tests conducted at elevated temperatures cause a decrease in the apparent yield and flow stress. Model fits to the data are shown to provide a reasonable approximation of real world behavior.
The original document contains color images.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | AMORPHOUS POLYMERS COMPRESSION DEFORMATION FLOW STRESS HARDENING HIGH TEMPERATURE KOLSKY BAR MECHANICAL PROPERTIES Mechanics Plastics POLYCARBONATES Polymer Chemistry POLYMER MODELING POLYMER POLYCARBONATE POLYMER TESTING RATE EFFECT ROOM TEMPERATURE STRAIN RATE STRENGTH(MECHANICS) TEMPERATURE EFFECT TENSILE TESTS TENSION THERMAL SOFTENING THERMOPLASTIC RESINS TRANSPARENT ARMOR TRANSPARENT MATERIALS UNIAXIAL STRESS YIELD |
| title | Mechanical Response of Polycarbonate with Strength Model Fits |
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