Plastic energy dissipation during crack extension

1973 ◽  
Vol 9 (3) ◽  
pp. 345-348 ◽  
Author(s):  
S. K. Bhandari
Keyword(s):  
Energy Dissipation ◽  
Crack Extension ◽  
Plastic Energy

Experimental study and numerical simulation of clapboard lead damper

2016 ◽  
Vol 231 (9) ◽  
pp. 1688-1698 ◽  
Author(s):  
SL Cheng ◽  
SY Du ◽  
XS Yan ◽  
Q Guo ◽  
YJ Xin
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Type A ◽  
Loading Test ◽  
Plastic Energy ◽  
Yield Displacement ◽  
Lead Metal ◽  
Reduction Effect ◽  
Hysteretic Properties ◽  
Good Agreement

Two types of clapboard-type lead dampers were designed based on plastic energy absorption of lead metal. The hysteretic curves and energy dissipation properties were studied through low cyclic loading test. Also, the typical restoring load model was extracted. The finite-element numerical model of type-A damper was build according to the characteristics and principle of clapboard-type lead dampers. And the damping effect of high-structural Benchmark model installed with type-A damper was analyzed. The results show that the structure of clapboard-type lead dampers is simple, hysteretic curves are plump, hysteretic properties are steady and yield displacement is small, and thus its energy dissipation ability is excellent. The models of finite element and restoring load of dampers are in good agreement with the results of tests, so they have good applicability. The seismic system installed with type-A dampers has an excellent vibration reduction effect. The top-floor acceleration and displacement control effects are 26.7% and 37.4%, respectively.

scholarly journals Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 460 ◽  
Author(s):  
Tao Wang ◽  
Zhen Li ◽  
Liangmo Wang ◽  
Zhengdong Ma ◽  
Gregory Hulbert
Keyword(s):  
Energy Dissipation ◽  
Relative Density ◽  
Cellular Structure ◽  
Three Dimensional ◽  
Analytical Formula ◽  
Absorption Capacity ◽  
Plastic Energy ◽  
Theoretical Predictions ◽  
Auxetic Structure

Dynamic behaviors of the three-dimensional re-entrant auxetic cellular structure have been investigated by performing beam-based crushing simulation. Detailed deformation process subjected to various crushing velocities has been described, where three specific crushing modes have been identified with respect to the crushing velocity and the relative density. The crushing strength of the 3D re-entrant auxetic structure reveals to increase with increasing crushing velocity and relative density. Moreover, an analytical formula of dynamic plateau stress has been deduced, which has been validated to present theoretical predictions agreeing well with simulation results. By establishing an analytical model, the role of relative density on the energy absorption capacity of the 3D re-entrant auxetic structure has been further studied. The results indicate that the specific plastic energy dissipation is increased by increasing the relative density, while the normalized plastic energy dissipation has an opposite sensitivity to the relative density when the crushing velocity exceeds the critical transition velocity. The study in this work can provide insights into the dynamic property of the 3D re-entrant auxetic structure and provides an extensive reference for the crushing resistance design of the auxetic structure.

Plastic energy dissipation in mixed-mode fracture

1995 ◽  
Vol 73 (1) ◽  
pp. R3-R8 ◽  
Author(s):  
V. Boniface ◽  
K. R. Y. Simha
Keyword(s):  
Energy Dissipation ◽  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Plastic Energy

Plastic Energy Dissipation Model for Lifetime Prediction of Zirconium and Zircaloy-4 Fatigued at RT and 400°C

1998 ◽  
Vol 120 (2) ◽  
pp. 114-118 ◽  
Author(s):  
Xiao Lin ◽  
Gu Haicheng
Keyword(s):  
Electron Microscopy ◽  
Energy Dissipation ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
Damage Mechanism ◽  
Fatigue Properties ◽  
Dissipation Energy ◽  
Plastic Energy ◽  
Plastic Dissipation

Low cycle fatigue properties of zirconium and zircaloy-4 were investigated at RT and 400°C. The microscopic structure was determined using scanning electron microscopy and transmission electron microscopy techniques. On the basis of analyses of fatigue damage mechanism, it is believed that fatigue is an irreversible energy dissipation process. Thus, the plastic dissipation energy per cycle is selected as a fatigue damage variable. The accumulated plastic dissipation energy is calculated at the condition of considering cyclic hardening, saturation and softening characters of zirconium and zircaloy-4 during cycling. The testing results show that there present a power law between the plastic dissipation energy and fatigue lifetime.

Continuous microscratch measurements of the practical and true works of adhesion for metal/ceramic systems

1996 ◽  
Vol 11 (12) ◽  
pp. 3133-3145 ◽  
Author(s):  
S. Venkataraman ◽  
D. L. Kohlstedt ◽  
W. W. Gerberich
Keyword(s):  
Thin Film ◽  
Energy Dissipation ◽  
Film Thickness ◽  
Annealing Temperature ◽  
Plastic Work ◽  
Practical Work ◽  
Work Of Adhesion ◽  
Plastic Energy ◽  
Annealing Conditions ◽  
Metal Ceramic

Using a continuous microscratch technique, the adhesion strengths of Pt, Cr, Ti, and Ta2N metallizations to NiO and Al2O3 substrates have been characterized. The practical work of adhesion was determined as a function of both thickness and annealing conditions. For all except the Ta2N films, the practical work of adhesion increases nonlinearly from a few tenths of a J/m2 to several J/m2 as the thickness of the thin film is increased, indicating that a greater amount of plastic work is expended in delaminating thicker films. Further, the practical work of adhesion also increases with increasing annealing temperature, indicating stronger bonding at the interface. In the limit that the film thickness tends to zero, the plastic energy dissipation in the film tends to zero. As a result, the extrapolation to zero thickness yields the true work of adhesion for that system.

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