Determination of the high-strain rate elastic modulus of printing resins using two different split Hopkinson pressure bars

Abstract

The usage of resin-based materials for 3D printing applications has been growing over the past decades. In this study, two types of resins, namely a MMA-based resin and an ABS-based tough resin, are subjected to compression tests on a split Hopkinson pressure bar to deduce their dynamic properties under high strain rate loading.Two Hopkinson bar setups are used, the first one is equipped with aluminum bars and the second one with PMMA bars. From the measured strain waves, elastic moduli at high strain rates are derived. Both setups lead to values of $E=3.4$ E = 3.4 –3.8 GPa at a strain rate of about 250 s−1. Numerical simulations support the experiments. Moreover, considering the waves gained from the two different bar setups, PMMA bars appear to be well-suited for testing resin samples and are therefore recommended for such applications.

A novel flexible biocomposite with hemp woven fabric and natural rubber based on lignin green filler: investigation numerical and experimental under high-velocity impact

“…In this study, three measurements were made for each of the samples with the same strain rate so that an average behavior of the desired material could be obtained and the dispersion of the test results could be checked. Based on the assumption we mentioned, we can calculate strain rate, strain, and stress histories using equations (1)-(3) [64].…”

Experimental Investigation of Unidirectional Glass-Fiber-Reinforced Plastics under High Strain Rates

“…These pulseshapers are thin lead discs with a diameter of 8 mm and a thickness of 0.2-0.3 mm; they increase the pulse's rise time to its maximum. Discs made of lead have already been used with aluminum bars and have proven to be suitable pulseshapers [22]. In addition, high spectrum frequencies are filtered out of the signal (low-pass filter), resulting in a smoother pulse, cf.…”

Analysis of Stress, Strain and Young's Modulus of Specimens under Propagation of the 1D Linear Elastic Stress Waves

“…This influence is especially pronounced when considering brittle materials like concrete or soil-based substrates [3,4] .Moreover, a myriad of studies has incorporated the curve of the elastic phase when formulating the material's constitutive equations or delving into its viscoelastic properties. These analyses frequently discuss its viscoelastic characteristics and the so-called dynamic Young's modulus [5][6][7][8][9] . Yet, the validity of the Young's modulus drawn from SHPB test data has been a bone of contention.…”