Abstract
Metal foams are often used as energy absorbers and lightweight materials. Inspired by a natural blueprint, open‐cell metal foams can significantly reduce the mass of a structure. The innovative manufacturing process of electrodeposition provides the possibility to customize the coating layer thickness of nickel (Ni) on a polyurethane (PU) precursor foam. Consequently, the mechanical properties can be adjusted according to the requirements of the expected application. Herein, quasistatic compression tests and low‐velocity impact tests are conducted on open‐cell Ni/PU hybrid foams to investigate the strain‐rate effects for strain rates in the range of 10−3 to 550 s−1. Furthermore, digital image correlation is performed with the intention of comparing the micromechanical deformation mechanisms under quasistatic loading with those under dynamic loading. For the first time, the heat evolution at different impact velocities of metal foams has been investigated with an infrared camera.
Highlights
The origin of metal foams dates back to the 1950s, this class of material has gained considerable attention during the last few decades.[1]
When the compressive strength, which is termed the plastic collapse stress (PCS), is reached, a whole pore layer collapses and the stress–strain curve achieves the second phase with a distinct plastic stress plateau
The dynamic stress–strain data indicate a superimposed oscillation which originates from vibrations of the test rig
Summary
The origin of metal foams dates back to the 1950s, this class of material has gained considerable attention during the last few decades.[1]. Www.advancedsciencenews.com www.aem-journal.com precisely by varying the thickness of the coating, depending on the intended application This class of open-cell metal foams consists of 3D connected and stochastically distributed pores. The second reason for strain-rate sensitivity correlates with a shock wave propagation and enhancement at velocities of above 50 m sÀ1 This effect can be neglected for low velocity impacts. The experimental investigation of the mechanical behavior of metal foams under drop-weight impact tests focused predominantly on closed-cell aluminum foams.[43,44,45] Jung et al.[11] investigated the effect of strain rate on the compression of open-cell aluminum foams and Ni/Al hybrid composite foams from quasistatic to low-velocity impact loading. Strain rates ranged from quasistatic (10À3 sÀ1) by servohydraulic loading to low-velocity impact (550 sÀ1) using a drop-weight impact rig. Several tests were recorded with an infrared (IR) camera to observe the heat evolution at different impact velocities
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