A Preliminary Proposition for a Test Method to Measure (Impact) Damage Resistance

Lagacé, Paul A.; Williamson, James E.; Tsang, P. H. Wilson; Wolf, Edward; Thomas, Stephen

doi:10.1177/073168449301200508

Cited by 72 publications

(32 citation statements)

References 7 publications

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“…Other authors conclude that LVI and QSI are different for C/E [1,8,10,14,15,17]. Kwon and Sankar [14] and Highsmith [10] conclude that QSI leads to a larger damage zone compared to LVI, contradicting with Lagace [15] and the results of Kaczmarek [13].…”

Section: Introductioncontrasting

confidence: 52%

“…Kwon and Sankar [14] and Highsmith [10] conclude that QSI leads to a larger damage zone compared to LVI, contradicting with Lagace [15] and the results of Kaczmarek [13]. Nettles and Hodge [17] and Breen et al [8] show results that indicate QSI leads to a more than 10 % higher load compared to LVI, the opposite is seen by Abdallah et al [1] who observe a 15 % reduction in load.…”

Section: Introductioncontrasting

confidence: 39%

“…Some authors suggest using maximum force as governing parameter of impact damage [11,15]. If material rate-dependency plays a role, it affects the maximum force, so it cannot be used.…”

Section: Resultsmentioning

confidence: 99%

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Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

et al. 2018

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The results of a low-velocity impact programme on both carbon/epoxy and glass/polyamide-6 composite laminates are compared to the results of quasi-static indentation. Cross-ply and quasiisotropic stacking sequences are impacted and quasi-static indentation tests are performed up to the same maximum displacement. The response of the laminates to both test methods is compared in terms of force-displacement behaviour, dissipated energy and resulting damage. Significant differences between low-velocity impact and quasi-static indentation are found for both material systems. It is therefore concluded that the test methods cannot be interchanged for material characterisation.

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Section: Introductioncontrasting

confidence: 52%

Section: Introductioncontrasting

confidence: 39%

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Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

et al. 2018

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“…As shown by Jackson and Poe (1993) and Lagace et al (1993), large mass impacts and static loading on monolithic laminates give virtually identical relations between damage size and peak load. Observations on the equivalence of damage resulting from static loads and quasi-static impact loads on sandwich panels have been reported by Williamson and Lagace(1993).…”

Section: Force Fmentioning

confidence: 77%

Simplified theory for contact indentation of sandwich panels

Olsson¹,

Manus²

1995

36th Structures, Structural Dynamics and Materials Conference

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Previous attempts to analyze indentation of sandwich panels have been based on small deflection theory and an assumed elastic core behaviour. The agreement with experiments was poor. The present work includes core crushing and large deflections of the face sheets in a simplified model of sandwich contact indentation. The model assumes transverse isotropy with respect to the load axis and is based on an infinite, elastic face sheet on a core bonded to a rigid foundation. The core is assumed to be elastic in tension and elastic-ideally plastic in compression. After initiation of core yielding the problem is separated in two regions. In the inner, plastic region, the core has yielded and exert a constant reactive pressure on the face sheet. In the outer region the core acts as an elastic foundation. The plastic radius is found by matching boundary conditions for the two regions.The outer region is modeled as a plate on an elastic foundation. The inner region is modeled using three different approaches. For small deflections classical plate theory with shear corrections is used. For intermediate deflections an upper limit of the contact force is given by first order large deflection plate theory and a lower limit by small deflection plate theory. The asymptotic behaviour at large deflections is given by an approximate solution based on membrane theory. The three solutions, which all require iteration, have been put in dimensionless form and tabulated. The approach due to Hertzian contact has been included in the plate solution. Bounds have been given for the residual indentation after unloading. Approximate expressions are given for analysis of orthotropic face sheets.Good agreement with experiments was found for sandwich panels of different materials and thickness. The often observed, approximately linear, load-indentation relation is found to be the combined effect of softening due to core crushing and stiffening due to face sheet membrane effects. A limited parametric study indicates a strong influence of the core yield stress and the face sheet properties, and a relatively weak influence of the thickness and elastic properties of the core. The local indentation model may be used in a global impact model to predict impact response of sandwich panels, or as a starting point for more detailed stress analyses for prediction of damage due to impact and contact loads.

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“…Several studies [5][6][7][8][9][10] show a similarity between quasi-static indentation and drop weight impact testing. While other studies [11][12][13] have shown a limit to the applicability of using quasi-static indentation to represent low velocity impact. It must be noted that there are many variables involved in these tests such as boundary conditions, specimen size, specimen thickness, stacking sequence, impactor size, impactor shape and type of fiber/resin system.…”

Section: Introductionmentioning

confidence: 99%

Comparison with Low-Velocity Impact and Quasi-staticIndentation Testing of Foam Core Sandwich Composites

Li¹,

An²,

Yi³

2012

IJAPM

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Abstract-The need for quasi-static indentation test method for modeling low-velocity foreign object impact events would prove to be very beneficial to researchers. In order to examine whether it is feasible, series of quasi-static indentation and low-velocity impact tests were carried out and compared. An analysis of the relationships between impact energy (or quasi-static indentation force) and damage area, dent depth indicates clearly that dent depth was selected as the damage parameter to set up damage relationship between the two tests. The knee points of dent depth appearing in the two tests curves were very close. The variation tendency of the dent depth, the process curves and the cross sectional damage views of the two tests were in similarity. Results show that no distinct differences could be seen between low-velocity impact and quasi-static indentation testing, indicating that quasi-static indentation testing can be used to represent low-velocity impact testing.

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A Preliminary Proposition for a Test Method to Measure (Impact) Damage Resistance

Cited by 72 publications

References 7 publications

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

Simplified theory for contact indentation of sandwich panels

Comparison with Low-Velocity Impact and Quasi-staticIndentation Testing of Foam Core Sandwich Composites

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