Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials

Song, Bo; Sanborn, Brett; Susan, Donald; Johnson, Kyle; Dabling, Jeffrey; Carroll, Jay; Brink, Adam; Grutzik, Scott; Kustas, Andrew

doi:10.1016/j.ijimpeng.2019.103328

Title: Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials

Abstract

Cylindrical dog-bone (or dumbbell) shaped samples have become a common design for dynamic tensile tests of ductile materials with a Kolsky tension bar. When a direct measurement of displacement between the bar ends is used to reveal the specimen strain, the actual strain in the specimen gage section is overestimated due to strain in the specimen shoulder and needs to be corrected. The currently available correction method works well for elastic-perfectly plastic materials but may not be applicable to materials that exhibit significant work-hardening behavior. Here, we developed a new specimen strain correction method for materials possessing an elastic-plastic with linear work-hardening stress-strain response. A Kolsky tension bar test of a Fe-49Co-2V alloy (known by trade names Hiperco and Permendur) was used to demonstrate the new specimen strain correction method. This new correction method was also used to correct specimen strains in Kolsky tension bar experiments on two other materials: 4140 alloy, and 304L-VAR stainless steel, which had different work-hardening behavior.

Authors:

Song, Bo ^[1]; Sanborn, Brett ^[1]; Susan, Donald ^[1]; Johnson, Kyle ^[1]; Dabling, Jeffrey ^[1]; Carroll, Jay ^[1]; Brink, Adam ^[1]; Grutzik, Scott ^[1]; Kustas, Andrew ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Publication Date:: Fri Jun 21 00:00:00 EDT 2019

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1529150

Alternate Identifier(s):: OSTI ID: 2325275

Report Number(s):: SAND-2019-2657J
Journal ID: ISSN 0734-743X; 673321

Grant/Contract Number:: AC04-94AL85000; NA0003525

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of Impact Engineering

Additional Journal Information:: Journal Volume: 132; Journal Issue: C; Journal ID: ISSN 0734-743X

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Kolsky tension bar; Strain correction; Work hardening; Stress-strain; Dynamic tension

Citation Formats


                    Song, Bo, Sanborn, Brett, Susan, Donald, Johnson, Kyle, Dabling, Jeffrey, Carroll, Jay, Brink, Adam, Grutzik, Scott, and Kustas, Andrew. Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials.  United States: N. p., 2019. 
Web.  doi:10.1016/j.ijimpeng.2019.103328.

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                    Song, Bo, Sanborn, Brett, Susan, Donald, Johnson, Kyle, Dabling, Jeffrey, Carroll, Jay, Brink, Adam, Grutzik, Scott, & Kustas, Andrew. Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials.  United States.  https://doi.org/10.1016/j.ijimpeng.2019.103328

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                    Song, Bo, Sanborn, Brett, Susan, Donald, Johnson, Kyle, Dabling, Jeffrey, Carroll, Jay, Brink, Adam, Grutzik, Scott, and Kustas, Andrew. Fri .  
"Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials".  United States.  https://doi.org/10.1016/j.ijimpeng.2019.103328.  https://www.osti.gov/servlets/purl/1529150.

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@article{osti_1529150,

  title        = {Correction of Specimen Strain Measurement in Kolsky Tension Bar Experiments on Work-Hardening Materials},

  author       = {Song, Bo and Sanborn, Brett and Susan, Donald and Johnson, Kyle and Dabling, Jeffrey and Carroll, Jay and Brink, Adam and Grutzik, Scott and Kustas, Andrew},

  abstractNote = {Cylindrical dog-bone (or dumbbell) shaped samples have become a common design for dynamic tensile tests of ductile materials with a Kolsky tension bar. When a direct measurement of displacement between the bar ends is used to reveal the specimen strain, the actual strain in the specimen gage section is overestimated due to strain in the specimen shoulder and needs to be corrected. The currently available correction method works well for elastic-perfectly plastic materials but may not be applicable to materials that exhibit significant work-hardening behavior. Here, we developed a new specimen strain correction method for materials possessing an elastic-plastic with linear work-hardening stress-strain response. A Kolsky tension bar test of a Fe-49Co-2V alloy (known by trade names Hiperco and Permendur) was used to demonstrate the new specimen strain correction method. This new correction method was also used to correct specimen strains in Kolsky tension bar experiments on two other materials: 4140 alloy, and 304L-VAR stainless steel, which had different work-hardening behavior.},

  doi          = {10.1016/j.ijimpeng.2019.103328},

  journal      = {International Journal of Impact Engineering},

  number       = C,

  volume       = 132,

  place        = {United States},

  year         = {Fri Jun 21 00:00:00 EDT 2019},

  month        = {Fri Jun 21 00:00:00 EDT 2019}

}

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https://doi.org/10.1016/j.ijimpeng.2019.103328

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Figures / Tables:

Figure 1: Schematic of a Kolsky tension bar (a); and a typical dog-bone specimen design (b).

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