Higher Rate and Impact Tests

Silva, Lucas F. M. da; Adams, Robert D.; Blackman, B.R.K.; Goglio, Luca; Peroni, Marco; Sato, Chiaki; Dilger, Klaus; Frauenhofer, Michael; Kreling, Stefan

doi:10.1002/9783527647026.ch4

Cited by 8 publications

(16 citation statements)

References 54 publications

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“…4 has been developed. It combines technological solutions from the test rig of Beevers & Ellis [19] and from Split Hopkinson Pressure Bar (SPHB) testing means [12]. As it is shown in Fig.…”

Section: Global Descriptionmentioning

confidence: 99%

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An experimental method dedicated to the dynamic characterization of structural adhesives under drop weight conditions

Valès

Marguet

Créac’Hcadec

et al. 2019

International Journal of Adhesion and Adhesives

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Adhesive bonding is a commonly used method in multi-materials assemblies dedicated to the transport fields. In order to ensure structures integrity and users safety, the knowledge of the mechanical behaviour of structural adhesives used in these assemblies under impact conditions appears to be an essential prerequisite. To date, numerous tests combining usual specimens geometry e.g. single lap joint, butt joint, etc. and high velocity testing rigs exist and are used. Among these, most allow comparative studies and a few provide a partial identification of the material properties of the investigated adhesive. In this study, an experimental method dedicated to the dynamic characterization of structural adhesives under drop weight condition is proposed. On the basis of existing works, a modified Arcan specimen and a dynamic tensile testing mean were developed and are presented. The Arcan geometry allows to test the adhesive under various loading directions and so to obtain its mechanical response envelope. Design strategies are also implemented in order to obtain time stable and quasi-homogeneous stress distributions in the adhesive during the tests. At last, the dynamic characterization of a Dow ® Betamate TM 1496V adhesive is proposed. Results are repeatable and show a strain rate dependent behaviour validating the appropriateness of the experimental approach.

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“…4 has been developed. It combines technological solutions from the test rig of Beevers & Ellis [19] and from Split Hopkinson Pressure Bar (SPHB) testing means [12]. As it is shown in Fig.…”

Section: Global Descriptionmentioning

confidence: 99%

“…automobile crash, aircraft impact etc. Goglio in [11], da Silva et al in [12] and Sato in [8] provide excellent reviews of these experimental test methods.…”

mentioning

confidence: 99%

An experimental method dedicated to the dynamic characterization of structural adhesives under drop weight conditions

Valès

Marguet

Créac’Hcadec

et al. 2019

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

show abstract

“…Hence, understanding the mechanical behaviour of these joints under dynamic and combined loadings appears to be a prerequisite to ensure user safety [1,2]. Nowadays, several tests methods dedicated to the study of adhesively bonded joints are available under dynamic conditions [3][4][5]. The most commonly used are Izod and Charpy pendulums [6][7][8][9], Hopkinson bar techniques [10][11][12][13], drop weight machines [1,[14][15][16] and servo hydraulic systems [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The standard test method for apparent shear strength of single-lap-joint adhesively bonded metal specimens by tension loading according to the ASTM D1002 [19] is very commonly used for the characterization of bond strength of adhesive joint under quasi-static loading. The single-lap joint (SLJ) geometry used for this test is also the most studied in dynamics [1,4,8,9,14,15,20] due to low production costs, its ease of implementation and its similarity with geometry of many practical application [2,3]. However, this type of test leads to three major difficulties if the aim is to develop a law of mechanical behaviour that can be implemented in a finite element code for simulation purposes: (1) Due to thin substrates, this test generates a complex mix of shear and normal stresses in the adhesive layer [2,3,21].…”

Section: Introductionmentioning

confidence: 99%

“…The single-lap joint (SLJ) geometry used for this test is also the most studied in dynamics [1,4,8,9,14,15,20] due to low production costs, its ease of implementation and its similarity with geometry of many practical application [2,3]. However, this type of test leads to three major difficulties if the aim is to develop a law of mechanical behaviour that can be implemented in a finite element code for simulation purposes: (1) Due to thin substrates, this test generates a complex mix of shear and normal stresses in the adhesive layer [2,3,21]. (2) Because of a high rigidity gradient between adhesive and substrates, a higher level of stress is concentrated at the ends of the overlap.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of the local behaviour of adhesive bonds under dynamic loading

Valès

Marguet

Créac’Hcadec

et al. 2016

Journal of Adhesion Science and Technology

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Nowadays, adhesively bonded structures are widely used in the transport sector for the development of lightweight vehicles. In order to guarantee passenger safety, it is thus necessary to understand the behaviour of such assemblies under dynamic and combined loadings. This paper presents a numerical study of the local behaviour of adhesively bonded assemblies under dynamic loading. In a first part, the ASTM D950-03 block impact test is studied. This device does not enable an homogeneous loading of the adhesive and causes stress concentrations. On the basis of existing quasi-static works, strategies are then implemented at a local scale. By combining a specific substrates geometry and by limiting the stiffness gradient between the substrates and the adhesive, results show that it is possible to obtain a qualitatively acceptable stress fields in the adhesive for mechanical characterization under dynamic loadings. The Arcan TCS device mentioned below, uses such solutions to characterize the mechanical behaviour of bonded joints subjected to combined quasi-static loadings. In this study, the question of its extensibility to dynamic loadings by the use of an impactor guided into a drop tower is investigated. A dedicated finite element model is built under the plane stress assumption. The stress distributions in the adhesive are analysed through time and space for several loading conditions. The stress versus time signals are then compared with the results coming from modal analysis in order to highlight the vibration behaviour of the device, directly linked to the configuration.

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