Dynamic effects during instrumented impact testing

Sahraoui, S.; Lataillade, Jean-Luc

doi:10.1016/0013-7944(90)90278-o

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The data from the impact load histories were interpreted by using previously published methods (1, [21][22][23][24][25][26][27][28][29][30][31][32][33]. Load-time responses similar to those shown in Fig.…”

Section: Interpretation Of the Impact Load Historiesmentioning

confidence: 99%

“…The magnitude of the inertial load changes proportionally with impact velocity, whereas the mechanical response of the materials (incipient point of damage) is not usually so strain-sensitive (22, [24][25][26]. The magnitude of the inertial effects and the undesirable oscillations that are often superimposed on the main load curve can be reduced by lowering the impact velocities, placing a thin sheet of rubber between the specimen and the support (mechanical filtering), electrical filtering methods and mathematical filtering treatments (22,(24)(25)(26)(27)(28)(29)(30)(31)(32)(33). Spikes similar to the one at point P,, in Fig.…”

Section: Interpretation Of the Impact Load Historiesmentioning

confidence: 99%

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Damage evolution in low velocity impacted unreinforced vinyl ester 411‐350 and 411‐C50 resin systems

et al. 2000

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Damage evolution in plaques made of vinyl ester resin systems was investigated as a function of specimen thickness, impact energy level and matrix material. Dow DERAKANE vinyl ester 41 1-350 and 41 1-C50 resin systems, which have low viscosity and are ideally suited for low-cost liquid processing techniques like vacuum assisted resin transfer molding (VAIITM). were considered for the low velocity instrumented impact testing. Characterization of damage evolution was undertaken using optical microscopy and analysis of impact load histories recorded during the impact event. Radial cracking, perforations at the point of impact [in the form of a truncated cone), and damage resulting from the support constraints were identified as the dominant failure characteristics in both resin systems. Radial cracking, which originated from the bottom surface, was operative in all failed specimens and was attributed to the catastrophic failure due to extensive flexural tensile strength losses. For specimens that could deflect significantly, radial cracking and supportconstraint-induced damage were the operative failure mechanisms. Radial cracking and through-thickness shearing led to failure in stiffer plaques. The DERAKANE 4 1 1 -350-vinyl ester resin system was found more damage resistant than the 4 1 14250 system.

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Section: Interpretation Of the Impact Load Historiesmentioning

confidence: 99%

Section: Interpretation Of the Impact Load Historiesmentioning

confidence: 99%

Damage evolution in low velocity impacted unreinforced vinyl ester 411‐350 and 411‐C50 resin systems

et al. 2000

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“…Interpretation of the impact load histories was performed by using previously published methods [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Load-time traces similar to those shown in figures 4(a) and (b) for neat resin plaques and laminates, respectively, were recorded.…”

Section: Data Interpretationmentioning

confidence: 99%

Parametric studies on self-repairing approaches for resin infused composites subjected to low velocity impact

Motuku

Vaidya

Janowski

1999

Smart Mater. Struct.

203

104

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Low velocity impact response of glass reinforced polymer composites, which have the potential to self-repair both micro- and macro-damage, has been investigated. This class of material falls under the category of passive smart polymer composites. The self-repairing mechanism is achieved through the incorporation of hollow fibers in addition to the normal solid reinforcing fibers. The hollow fibers store the damage-repairing solution or chemicals that are released into the matrix or damaged zone upon fiber failure. Plain-weave S-2 glass fabric reinforcement, vinyl ester 411-C50 and EPON-862 epoxy resin systems were considered for this study. Different tubing materials were investigated for potential use as storage materials for the repairing chemicals instead of the actual hollow repair fibers and included borosilicate glass micro-capillary pipets, flint glass pasteur pipets, copper tubing and aluminum tubing. composite panels were fabricated by using a vacuum assisted resin transfer molding process. The present investigation addressed fabrication of self-repairing composite panels and some of the parameters that influence the response of self-repairing composites to impact loading. Specific issues addressed by this study include: the processing quality; the selection of storage material for the repairing solution; release and transportation of the repairing solution; the effect of the number, type and spatial distribution of the repairing tubes, specimen thickness, matrix material and impact energy level.

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“…Sahraoui and Lataillade [26] presented a method to analyse dynamic effects in instrumented impact testing for fracture toughness determination and conducted a modal analysis of the mechanical system, i.e. specimen-loading machine.…”

Section: Introductionmentioning

confidence: 99%

Modal Analysis of a Servo-Hydraulic High Speed Machine and its Application to Dynamic Tensile Testing at an Intermediate Strain Rate

et al. 2010

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This paper describes the experimental procedure to identify the predominant frequencies of the high speed testing machine by conducting modal analysis. The effects due to the predominant frequencies of the system and loading rate on the magnitude of system ringing and the flow stress were analyzed by using a single degree-offreedom (SDOF) spring-mass-damper model. The system was then used to study the dynamic tensile behavior of two engineering materials, i.e., polyethylene (PE) fabric-cement composite and Alkaline Resistant (AR) glass fabrics at an intermediate strain rate. The stress oscillations in the response of these materials due to system ringing were addressed. The failure behavior of each material was studied by examining high speed digital camera images of specimens during the test. The validity of the dynamic tensile tests was investigated by examining the condition of dynamic stress equilibrium-a criterion used in split Hopkinson pressure bar (SHPB) tests. The results show that the quantitative criterion for a valid SHPB test is also applicable to dynamic tensile tests of these materials at the intermediate strain rate.

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Dynamic effects during instrumented impact testing

Cited by 7 publications

References 6 publications

Damage evolution in low velocity impacted unreinforced vinyl ester 411‐350 and 411‐C50 resin systems

Damage evolution in low velocity impacted unreinforced vinyl ester 411‐350 and 411‐C50 resin systems

Parametric studies on self-repairing approaches for resin infused composites subjected to low velocity impact

Modal Analysis of a Servo-Hydraulic High Speed Machine and its Application to Dynamic Tensile Testing at an Intermediate Strain Rate

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