Dynamic tension of ductile polymers: Experimentation and modelling

Tzibula, S.; Lovinger, Zev; Rittel, D.

doi:10.1016/j.mechmat.2018.04.014

Cited by 16 publications

(18 citation statements)

References 22 publications

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“…Shortly after, R f decreases significantly with an average value of 0.03. This is similar to the observations of Tzibula et al [66], Zhang et al [67] and Hoffmann et al [68], indicating that dynamic force equilibrium is confirmed in the setup. The output force is used for the stress measurement of the specimen.…”

Section: Methodssupporting

confidence: 92%

Loading Mode and Lateral Confinement Dependent Dynamic Fracture of a Glass Ceramic Macor

Zhang

Townsend

Petrinić

et al. 2022

J. dynamic behavior mater.

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A systematic comparison of the tensile and compressive response of glass ceramic Macor, with zero porosity and low density, is carried out by using flattened Brazilian disk and cylindrical specimen from quasi-static to dynamic loading conditions. The experiments were performed on a screw driven Zwick machine and an in-house built split Hopkinson bar synchronized with a high speed photographic system. Likewise, the loading rate dependent fracture toughness is also investigated by using a notched semi-circular Brazilian disk. A digital image correlation technique is adopted to assist in the monitoring of strain field, crack initiation and propagation under dynamic loading conditions. Both tensile and compressive strength show loading rate dependencies, however, the static and dynamic tensile strengths are only 20% of the compressive strengths without confinement and less than 10% of the confined compressive strength. The microstructural characterization reveals the fracture mechanisms in unconfined Macor are predominantly transgranular with mica platelets and cleavage planes, which are influenced by the loading mode and loading rate. However, the Macor with confinement shows ductile fracture micrographs with a shear localization zone consisting of fine particles. With the use of Macor ceramic as a model material, the paper presents an economical approach to investigate the loading mode and pressure dependent failure of ceramic materials. This will support the characterization of dynamic properties of current and future developed advanced ceramics for demanding applications in the aero engine.

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Section: Methodssupporting

confidence: 92%

Loading Mode and Lateral Confinement Dependent Dynamic Fracture of a Glass Ceramic Macor

Zhang

Townsend

Petrinić

et al. 2022

J. dynamic behavior mater.

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“…Digital Image correlation (DIC) is a popular full-field measurement technique due to its non-contact features. A number of researchers have used this method to investigate the dynamic tensile behaviour and the necking phenomenon for mild steel [13], dual-phase high-strength steels [14,15], and ductile polymers [16].…”

Section: Introductionmentioning

confidence: 99%

Rate dependent behaviour and dynamic strain localisation of three novel impact resilient titanium alloys: Experiments and modelling

Zhang

Gour

Petrinić

et al. 2020

Materials Science and Engineering: A

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The tensile behaviour of three ductile titanium alloys, Ti0.7Al4V, Ti1Al4V and Ti3Al2.5V, conceived for impact containment applications, is characterized at quasi-static, intermediate and high strain rates. Tests have been performed using a screw driven mechanical system and a bespoke in-house developed split Hopkinson tension bar equipped with ultra-high speed photographic equipment 1. The three alloys present noticeable strain rate sensitivity. Ti1Al4V is characterised by the lowest flow stress and highest ductility of the three alloys. Ti3Al2.5V higher flow stress but lowest strain to failure while Ti0.7Al4V has similar flow stress but larger engineering failure strain compared to Ti3Al2.5V. The dynamic true strain rate, determined by measuring the time history of the minimum cross-section diameter during necking, reaches values up to one order of magnitude higher than the nominal strain rate. This phenomenon, occurring during dynamic strain localisation, is of fundamental importance for understanding and modelling the dynamic behaviour of ductile alloys designed to withstand impact loading. The experimental results are used to determine the material parameters of the Johnson-Cook (JC) and Khan-Huang-Liang (KHL) models, which are incorporated in the ABAQUS/explicit code for finite element simulations of the dynamic tensile tests. It is found that the KHL model predicts the experimentally measured strain field, deformed geometry, effective strain rate and macroscopic force-displacement response during the high strain rate experiments with significantly better agreement than the JC model.

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“…After the whole specimen reaches a uniform strain, a hardening phase is evident with a significant increase in the measured force, up to the occurrence of fracture. 31 The necking of B1 during stretching is shown in Figure S5. The molecular mechanism of cold drawing is that the crystallization was destroyed under tensile tress and pulled apart into smaller units.…”

Section: Resultsmentioning

confidence: 99%

Design of Robust Self-Healing Silicone Elastomers Based on Multiple H-Bonding and Dynamic Covalent Bond

2022

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A room-temperature self-healing silicone elastomer was prepared based on the synergistic effect of multiple H-bonding and dynamic covalent bond. The multiple bonds constructed by inserting thiourea into the polyurea network can inhibit the crystallization of hard urea H-bonds segments and activate the diffusion movement of polymer chains. Dynamic imine endows materials with a strong connection for the fracture interface by imine metathesis. The effect of thiourea on urea H-bonds was confirmed by the Fourier transform infrared spectrum, which showed obvious changes of H-bond density according to peak revolution of CO and N–H. Differential scanning calorimetry demonstrated the transition from the crystalline to amorphous state after the introduction of thiourea. Tensile tests and scratch-healing tests showed that this design method can improve the self-healing property without sacrificing the mechanical strength. Finally, the optimized self-healing process was analyzed from the perspectives of the contact process, the interpenetration diffusion of the polymer chain, and rebuilding of crosslinking points between the two interfaces, which would build an avenue for constructing a fast, self-healing, and tough material.

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Dynamic tension of ductile polymers: Experimentation and modelling

Cited by 16 publications

References 22 publications

Loading Mode and Lateral Confinement Dependent Dynamic Fracture of a Glass Ceramic Macor

Loading Mode and Lateral Confinement Dependent Dynamic Fracture of a Glass Ceramic Macor

Rate dependent behaviour and dynamic strain localisation of three novel impact resilient titanium alloys: Experiments and modelling

Design of Robust Self-Healing Silicone Elastomers Based on Multiple H-Bonding and Dynamic Covalent Bond

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