Dynamic Analysis of Thin Glass Under Ball Drop Impact With New Metrics

Abstract

Response of brittle plate to impact loads has been the subject of many research studies [1–7]. Specifically, glass presents a wide variety of applications in daily life, and helps to protect the displays of smartphones, tablets, PCs, and TVs from everyday wear and tear. Therefore, the necessity of glass to resist scratches, drop impacts, and bumps from everyday use leads to the importance of investigation of the glass response under dynamic impact loading. The ball drop test has been applied in the past, specifying an energy threshold as a prediction metric. Use of energy as the key parameter in impact testing is limited, since it does not account for the time spent in contact during the impact event. This study attempts to establish a reliable metric for impact testing based on a momentum change threshold. The deformation and the strain of the glass will be obtained by the Digital Image Correlation (DIC) system, while the rebound velocity will be measured with the high speed cameras. The global and local measurements are conducted to verify the accuracy of the experimental results. Finally, the FEA model is developed using ANSYS/LS-DYNA to provide a comprehensive understanding of the dynamic response of the glass. Excellent correlation in deflection is obtained between the measurements and predictions.

Experimental and numerical investigation of high velocity soft impact loading on aircraft materials

“…The laminated target consisted of two glass panels, one polymer interlayer and the rubber gaskets. The chemically toughened glass was modelled as an elastic material with density, ρ= 2440 kg m −3 , Young's Modulus, E = 71.7 GPa and Poisson's ratio, v = 0.21 (Xue et al 2017). Note that the response of the laminated glass windows was simulated only at impact velocities for which no fracture occurs in the glass layers.…”

Issues on the Vibration Analysis of In-Service Laminated Glass Structures: Analytical, Experimental and Numerical Investigations on Delaminated Beams

“…Assuming that a given glass member is restrained via mechanical supports having partial rotational stiffness Kr ≠ 0 (in kNm/rad) and Ks = ∞, the restraints act as flexible clamps that must be properly taken into account for design. Moreover, following Section 4.1, it is convenient to express these rotational and axial stiffness contributions as: = (9) and = (10) where Rr = 0 corresponds to the limit condition of a S-S beam and Rr = ∞ denotes the C-C configuration. As far as a monolithic or LG beam is taken into account in Equations (9) and (10), its bending stiffness EI can be expressed as a function of the total b × h or equivalent b × hef section (Equation (3)).…”

“…From a structural point of view, critical design conditions can include explosive events [3][4][5] and impacts [6][7][8], natural hazards and earthquakes [9,10], and dynamic loads in general (including moving loads, in the case of pedestrian systems [11][12][13][14][15][16]), whose effects need dedicated calculation methods.…”

Dynamics behavior of flat glass panels under impact conditions: Experiments and numerical modeling

“…Three different impact energies, 0.5, 1, and 2 J, and three steel balls size, 0.75, 1, and 2 in diameter are chosen. Some of the works reported in this draft are presented earlier at an International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK) . The constitutive relationship development of the hyperelastic material used in the experiments is further added to the current draft.…”

“…Some of the works reported in this draft are presented earlier at an International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK). 11 The constitutive relationship development of the hyperelastic material used in the experiments is further added to the current draft. In addition, results from the modified and improved numerical model are presented.…”