Nonlinear dynamic response of blast-loaded stiffened plates considering the strain rate sensitivity

2020 ◽  
Vol 70 ◽  
pp. 102699
Author(s):  
Ying Peng ◽  
Ping Yang ◽  
Kang Hu
Keyword(s):  
Dynamic Response ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Nonlinear Dynamic ◽  
Rate Sensitivity ◽  
Stiffened Plates ◽  
Nonlinear Dynamic Response

Nonlinear Dynamic Response of Elastically Supported Stiffened Plates with Initial Stresses and Geometric Imperfections Under Impact Loads

2020 ◽  
Vol 20 (04) ◽  
pp. 2050053
Author(s):  
Niu-Jing Ma ◽  
Li-Xiong Gu ◽  
Long Piao
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Dynamic Properties ◽  
Initial Stresses ◽  
Stiffened Plates ◽  
Impact Loads ◽  
Stiffened Plate ◽  
Geometric Imperfections ◽  
Nonlinear Dynamic Response ◽  
Elastically Supported

This paper deals with the nonlinear dynamic response of elastically supported stiffened plates with initial stresses under impact loads. A stiffened plate is assumed to be composed of a plate with some stiffeners, which are treated separately. The plate is modeled by the thin plate theory, whereas the stiffeners are considered as geometrically nonlinear Euler–Bernoulli beams. First, the equations of both the kinetic energies and strain energies of the plate and stiffeners are established. Then, the dynamic equilibrium equations for the stiffened plate are derived as the Lagrange’s equation of the functional. A parametric analysis is performed to evaluate how initial stresses, initial geometric imperfections, elastic supports, impact loads and configuration of stiffeners affect the time-history responses of the stiffened plates. Some useful nonlinear dynamic properties are obtained, which serve as references for engineering design and application.

The effect of strain-rate sensitivity on dynamic response of impulsively loaded sandwich beam

2018 ◽  
Vol 26 (20) ◽  
pp. 1743-1749
Author(s):  
Li-Hong Yang ◽  
Jia Qu ◽  
Guo-Cai Yu ◽  
Jin-Shui Yang ◽  
Lin-Zhi Wu
Keyword(s):  
Dynamic Response ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Sandwich Beam ◽  
Rate Sensitivity

scholarly journals Negative Strain Rate Sensitivity Induced by Structure Heterogeneity in Zr64.13Cu15.75Ni10.12Al10 Bulk Metallic Glass

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 339
Author(s):  
Xiang Wang ◽  
Zhi Qiang Ren ◽  
Wei Xiong ◽  
Si Nan Liu ◽  
Ying Liu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Sensitivity ◽  
Critical Role ◽  
Rate Sensitivity ◽  
Confined Compression ◽  
Negative Strain Rate Sensitivity ◽  
Cast Specimen ◽  
Structure Heterogeneity

The negative strain rate sensitivity (SRS) of metallic glasses is frequently observed. However, the physical essence involved is still not well understood. In the present work, small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM) reveal the strong structure heterogeneity at nanometer and tens of nanometer scales, respectively, in bulk metallic glass (BMG) Zr64.13Cu15.75Ni10.12Al10 subjected to fully confined compression processing. A transition of SRS of stress, from 0.012 in the as-cast specimen to −0.005 in compression processed specimen, was observed through nanoindentation. A qualitative formulation clarifies the critical role of internal stress induced by structural heterogeneity in this transition. It reveals the physical origin of this negative SRS frequently reported in structurally heterogeneous BMG alloys and its composites.

Strain rate sensitivity of a 1.5 GPa nanotwinned steel

2021 ◽  
Author(s):  
R.D. Liu ◽  
Y.Z. Li ◽  
L. Lin ◽  
C.P. Huang ◽  
Z.H. Cao ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity
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