An experimental study of pre-notched clamped beams under impact loading

Influence of notch on the elastic–plastic response of clamped beams subjected to low velocity impact

“…In the notched beam, the crack started at the notch corner and extended upwards resulting in strength failure. This type of failure was classified as Mode I crack extension (failure Mode V) by Chen and Yu [12]. Beams with 3 mm wide notch and 0.35 mm wide notch at the mid span broke when impacted by 10 kg hammer at the mid span (vide Fig.…”

“…Response and failure features were obtained for impact velocities between 30 and 110 m/s and they observed failure mode transition between a ductile tensile rupture failure and a shear banding failure. Chen and Yu [12] investigated experimentally the failure behavior of clamped aluminium beams with one and two pre-notches to projectile striking. They showed that, with the presence of pre-notches, the beam's dynamic response pattern would change from a global ductile plastic deformation to a local strength failure.…”

Prognosis for ballistic sensitivity of pre-notch in metallic beam through mesh-less computation reflecting material damage

“…In Liu et al (2013), it was showed through experiments and LS-Dyna simulation that the global deformation profile until failure is strongly dependent on amount of restraint provided at supports. A set of comprehensive experiments on pre-notched clamped beam with different sizes and locations of notch are given in Chen and Yu (2004) and Harsoor and Ramachandra (2009). The major observation was that the presence of notch may change the dynamic behaviour of the beam from global ductile to local strength failure.…”

“…Whereas the pre-notch characteristics (eccentricity, location, depth, width etc) are found to influence the onset of different failure modes (Chen and Yu, 2004), more precise characterisation is needed for notched beam behaviour to estimate the threshold energy to destabilize the structure and the energy absorbed by different counter-competing yet simultaneous dissipative mechanisms. Potential use of notch as a crack arrester at a desired location or the significant strength degradation due to its presence can be more efficiently studied based on that characterisation.…”

“…The pseudo-spring analogy and its integration with standard SPH framework to cater for material damage is demonstrated in Section 2. The computational model is then validated through some experimental results (Chen and Yu, 2004) in Section 3. The tensile tearing tendency at supports and punching tendency at impact zone in flawless beam are investigated in Section 4.…”