•High-rate tension behavior of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy is investigated.•Yield stress increases with strain rate and decreases with temperature.•Isothermal strain hardening behavior is insensitive to rate and temperature.•Adiabatic temperature rise leads to reduction of strain hardening rate.The effects of strain rate and temperature on the uniaxial tension responses of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy are systematically investigated over a wide range of strain rates, 0.001–1150 s−1, and initial temperatures, 293–573 K. Dynamic tension and recovery tests are conducted using a split-Hopkinson tension bar to obtain the adiabatic and isothermal stress-strain responses of the alloy at high strain rates. The experiments reveal that the tension behavior of the alloy is dependent on the strain rate and temperature. The value of initial yield stress increases with increasing strain rate and decreasing temperature, whereas the isothermal strain-hardening behavior changes little with strain rate and temperature over the full ranges explored. The adiabatic temperature rise is the main reason for the reduction of strain hardening rate during the high-rate deformation process. SEM observations indicate that the tension specimen is broken in a manner of ductile fracture. The phenomenologically based constitutive model, Johnson–Cook model, is suitably modified to describe the rate-temperature dependent deformation behavior of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy. The model correlations are in good agreement with the experimental data within the investigated range of strain rates and temperatures.

•Tension responses of TC11 are investigated over a wide range of strain rates.•Tension behavior of TC11 shows a positive strain-rate dependence.•Transition of rate sensitivity is observed at moderate strain rates.The effect of strain rate on the tension stress–strain responses of the Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy are investigated at strain rates ranging from 0.001 to 940 s−1. The values of tension yield strength increase with increasing strain rate. There exists the transition of rate sensitivity for flow stress under moderate-rate loading conditions. Moreover, strain rate has greater influence on the initial yielding than the strain hardening behavior. SEM observation shows that the alloy is broken in a manner of ductile fracture and the dimple size decreases with the increase of strain rate. A phenomenologically-based constitutive model is proposed to describe the rate-dependent tension behavior. The model correlations are in good agreement with the experimental data within the tested strain-rate range.

The tension responses of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si are investigated over a broad range of strain rates, 0.001–1150 s−1, and initial temperatures, 213–293 K. Tensile impact and recovery tests are carried out using the split Hopkinson tension bar technique to obtain the adiabatic and isothermal stress–strain behavior of the alloy at high strain rates. Experimental results indicate that the tension behavior of the alloy is dependent on the strain rate and temperature. The value of initial yield stress increases with increasing strain rate and decreasing temperature. The isothermal strain hardening behavior changes little at different strain rates and temperatures. The adiabatic temperature rise is the main reason for the reduction of strain hardening rate during the high-rate deformation process. SEM observations of the fracture surfaces indicate that the tension specimen is broken in a manner of ductile fracture. The Zerilli–Armstrong constitutive model incorporating the effect of thermal–mechanical coupling is used to describe the rate and temperature dependent deformation behavior of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy. The model results are very close to the experimental data within the tested range of strain rates and temperatures.

•Positive strain rate sensitivity for Ti–6.6Al–3.3Mo–1.8Zr–0.29Si is observed.•Rate sensitivity of yield strength is higher in tension than that in compression.•Tension–compression asymmetry increases with increasing strain rate.An experimental investigation is performed to explore the tension–compression asymmetry of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy over a wide range of strain rates. A split Hopkinson bar technique is used to obtain the dynamic stress–strain responses under uniaxial tension and compression loading conditions. Experimental results indicate that the alloy is a rate sensitive material. Both tension yield strength and compression yield strength increase with increasing strain rate. The mechanical responses of the alloy have the tension–compression asymmetry. The values of yield strength and subsequent flow stress in compression are much higher than that in tension. The yield strength is more sensitive to change with strain rate in tension than compression. The difference of the yield strength between tension and compression increases with the increase of strain rate. The tensile specimen is broken in a manner of ductile fracture presenting characteristic dimples, while the compressive specimen fails in a manner of localized shearing failure.

Tension stress–strain responses of polycarbonate are presented for strain rates of 1 × 10−3 s−1–1700 s−1 and temperatures ranging from −60 to 20 °C. The high rate tension tests are performed using a split Hopkinson tension bar apparatus. The influence of strain rate and temperature on the tension behavior of polycarbonate is investigated. Experimental results indicate that the tension behavior of polycarbonate exhibits nonlinear characteristics and rate-temperature sensitivity. The values of yield strength and strain at yield increase with the increase of strain rate and decrease with increasing temperature. A viscoelastic constitutive model consisting of a nonlinear spring and a nonlinear Maxwell element is proposed to characterize the rate and temperature dependent deformation behavior of polycarbonate prior to yielding.Highlight► Yield strength and strain at yield increase with increasing strain rate. ► Yield strength and strain at yield decrease with increasing temperature. ► The tension behavior is characterized by a nonlinear viscoelastic model.

Dynamic tensile tests were performed on polycarbonate using a split Hopkinson tension bar (SHTB) system. A prefixed short metal bar was used to generate the incident stress pulse. The shape of the incident pulse was controlled to meet the requirement of the one-dimensional experimental principle of SHTB. The dynamic tensile stress–strain responses of polycarbonate at high strain rates up to a rate of 1750 s−1 were obtained. Experimental results indicate that the tensile behavior of polycarbonate is dependent on the strain rate. Its yield stress and unstable strain all increase with the increased strain rate. The yield behavior was modeled for a wide range of strain rates based on the thermally activated theory. The correlation between the experimental data and the model is good.

In this paper, a new empirically based constitutive model, the modified Johnson–Cook (J–C) model, has been proposed to incorporate the strain rate effects on the initial yield stress and the strain hardening behavior, respectively. The new model can describe the stress–strain relation of metals over a wide range of strain rates. Based on the tensile impact recovery experimental technique, the material constants in the model can be experimentally determined using isothermal and adiabatic stress–strain curves at different strain rates. Good agreement is obtained between the experimental stress–strain curves for brass under both quasi-static and dynamic loadings and the modified model correlations.