Strength and Failure Energy for Adhesive Interfaces as a Function of Loading Rate

Weerasooriya, Tusit; Gunnarsson, C. Allan; Jensen, Robert E.; Chen, Weinong

doi:10.1007/978-1-4614-0216-9_9

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Weerasooriya et al [14] used a similar method to study the dynamic failure behavior of adhesive bond interfaces. Both Weerasooriya et al and Syn et al showed an increase in failure load and energy rate for fracture initiation as loading rate increased from low to high rates.…”

Section: Introductionmentioning

confidence: 98%

“…In the present work, a unique fracture specimen was developed similar to the specimens used in [13,14]. The specimen loading surfaces were designed to be curved instead of flat.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that there are two important criteria for valid and useful high rate fracture experiments: a state of dynamic equilibrium of the specimen, and a constant loading rate of the specimen during the experiment. Both of these criteria can be obtained by shaping the input loading pulse [8][9][10][11][12][13][14]. Additionally, low impedance materials, such as pre-cracked beams and polymer materials, frequently cause traditional strain gauge measurement techniques to be unusable.…”

Section: Introductionmentioning

confidence: 99%

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Fracture Response of Cross-Linked Epoxy Resins as a Function of Loading Rate

Whittie

Moy

Gunnarsson

et al. 2012

Dynamic Behavior of Materials, Volume 1

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The failure behavior of cross-linked polymer epoxies were investigated under Mode I fracture at low and high loading rates. By varying the monomer choices, the properties of the epoxies can be tailored to achieve a greater resistance to cracking and high impact toughness. For these experiments, a unique four-point bending specimen was developed. High rate experiments were conducted on a modified Split Hopkinson Pressure Bar (SHPB) with pulse-shaping. High speed digital imaging was used to determine the failure initiation, and allow for use of digital image correlation (DIC) to optically measure the crack opening displacement (COD) and crack propagation velocity. The experimental results are used to obtain the energy required to initiate fracture at various loading rates. The critical energy required to initiate fracture for this epoxy shows limited rate dependence from quasi-static to dynamic loading rates, but becomes rate sensitive when loaded at dynamic rates. The experimental procedures and results are discussed in this paper.

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Section: Introductionmentioning

confidence: 98%

“…In the present work, a unique fracture specimen was developed similar to the specimens used in [13,14]. The specimen loading surfaces were designed to be curved instead of flat.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracture Response of Cross-Linked Epoxy Resins as a Function of Loading Rate

Whittie

Moy

Gunnarsson

et al. 2012

Dynamic Behavior of Materials, Volume 1

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“…The combined research (1-3) allowed determination of fracture energies by examining the load-displacement curve from either the servo-hydraulic tester or through traditional split Hopkinson pressure bar (SHPB) bar analysis. However, measurement of fracture toughness through crack-tip opening displacements or local strain fields was well outside of the digital image correlation (DIC) system's resolution (2,3), as the epoxies and adhesives considered were quite brittle and displacements near the crack-tip are on the order of 10 m. Stress intensity factor solutions for butterfly specimens are not available in the literature, preventing comparison of the measured fracture energies with the expected stress intensity factors at the crack-tip.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Novel Fracture Toughness Testing Geometry

Love¹

2012

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Approved for public release; distribution is unlimited.ii REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)December 2012 REPORT TYPE ARL-TR-6266 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTComputational analyses were conducted on novel fracture toughness specimens known as "butterfly" specimens, which were developed at the U.S. Army Research Laboratory. A three-dimensional (3-D), J-integral technique was established and validated against published results for a simple geometry. The technique was then used to generate a stress intensity factor function for a range of geometries for the butterfly specimen. A displacement-based description of the load on the specimen was developed that removes the need to accurately determine the specimen/platen frictional effects, and 3-D analyses were conducted to elucidate specimen thickness effects and their implications on surface measurements that are taken during experimental studies. iii

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