Influence of impactor and target parameters on the nonlinear response and residual strength of curved thin composite plates

Ambur, Damodar R.; Starnes, James H.; Chunchu, Prasad B.

doi:10.2514/6.2000-1591

Cited by 1 publication

(3 citation statements)

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“…Swanson scaling investigation to the impact response of composite cylinders, and found that the cylinder radius is a geometric factor, and scales by λ [17]. Previous analytical and experimental studies [6][7][8][9][10][11] have shown that thin composite panels exhibit geometrically nonlinear response when impacted at very low impact energies. Thin flat panels exhibit a nonlinear stiffening response, and some thin curved panels exhibit an initial nonlinear softening response.…”

Section: Nonlinear Analysis and Scaling Rulesmentioning

confidence: 99%

“…The clamping screws that attach the fixture base-plate and face-plate penetrate the test specimen through holes drilled in the specimen. This fixture has been used in previous investigations [6][7][8][9], and was designed to minimize translations and rotations at the test section boundary. Satisfying these conditions is particularly important for studying the impact response of thin plates and curved panels in which geometrically nonlinear effects are significant.…”

Section: Test Apparatus and Testsmentioning

confidence: 99%

“…Therefore, scaling laws and analysis methods for these structures must include the effects of geometric nonlinearity. A geometrically nonlinear analysis method has been previously developed for predicting the elastic impact response of thin, curved, anisotropic panels [6][7][8][9]. The analysis method is based on the Lagrangian equations of motion, which are solved using the Rayleigh-Ritz method and assumed mode shapes.…”

Section: Nonlinear Analysis and Scaling Rulesmentioning

confidence: 99%

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Scaling the Non-linear Impact Response of Flat and Curved Composite Panels

Ambur

Chunchu

Rose

et al. 2005

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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The application of scaling laws to thin flat and curved composite panels exhibiting nonlinear response when subjected to low-velocity transverse impact is investigated. Previous research has shown that the elastic impact response of structural configurations exhibiting geometrically linear response can be effectively scaled. In the present paper, a preliminary experimental study is presented to assess the applicability of the scaling laws to structural configurations exhibiting geometrically nonlinear deformations. The effect of damage on the scalability of the structural response characteristics, and the effect of scale on damage development are also investigated. Damage is evaluated using conventional methods including C-scan, specimen de-plying and visual inspection of the impacted panels. Coefficient of restitution and normalized contact duration are also used to assess the extent of damage. The results confirm the validity of the scaling parameters for elastic impacts. However, for the panels considered in the study, the extent and manifestation of damage do not scale according to the scaling laws. Furthermore, the results indicate that even though the damage does not scale, the overall panel response characteristics, as indicated by contact force profiles, do scale for some levels of damage.

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