Damage Evolution During Rock Pulverization Induced by Dynamic Compressive Loading

2020 ◽  
Vol 125 (5) ◽  
Author(s):  
W. Yao ◽  
Y. Xu ◽  
K. Xia
Keyword(s):  
Damage Evolution ◽  
Compressive Loading ◽  
Dynamic Compressive Loading

scholarly journals A micromechanical Sliding-Damage Model Under Dynamic Compressive Loading

2019 ◽  
Author(s):  
Mohammad Hossein Ahmadi ◽  
Hamed Molladavoodi
Keyword(s):  
Damage Evolution ◽  
Consistency Condition ◽  
Damage Model ◽  
Micromechanical Model ◽  
Compressive Loading ◽  
Flow Rule ◽  
Frictional Sliding ◽  
Peak Region ◽  
Micro Cracks ◽  
Dynamic Compressive Loading

For most rock materials, there exists a strong coupling between plastic flow caused by sliding along micro-crack faces and damage evolution due to nucleation and growth of wing-cracks. The aim of this article is to develop the self-consistent based micromechanical model by taking into account the coupling between frictional sliding and damage process under dynamic compressive loading. The developed model algorithm was programmed in the commercial finite difference software environment for numerical simulation of rock material to investigate the relationship between the mechanical behaviour and microstructure. Eventually while the stress intensity factor at flaw tips exceeds the material fracture toughness, the wing-cracks are sprouted and damage evolution occurs. For frictional closed cracks, an appropriate criterion for the onset of frictional sliding along micro-cracks was proposed in this paper. Also, plastic strain increments were determined by the flow rule, consistency condition and normality rule within the thermodynamic framework. The simulation results demonstrate that the developed micromechanical model can adequately reproduce many features of the rock behaviour such as hardening prior to the peak strength, softening in post-peak region, damage induced by wing-cracks and irreversible deformations caused by frictional sliding along micro-cracks. Furthermore, the softening behaviour of material in post-peak region is affected and the material undergoes higher values of strains and damage up to the residual strength. Therefore, the rock sample simulation with the coupled frictional sliding-damage model could increase plasticity and ductility of the rock in post-peak region because of regarding plastic strains caused by the frictional sliding along micro-cracks.

Texture dependencies on flow stress behavior of magnesium alloy under dynamic compressive loading

Vacuum ◽  
2021 ◽  
pp. 110323
Author(s):  
Faisal Nazeer ◽  
Syed Zohaib Hassan Naqvi ◽  
Abul Kalam ◽  
A.G. Al-Sehemi ◽  
Hussein Alrobi
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Compressive Loading ◽  
Stress Behavior ◽  
Flow Stress Behavior ◽  
Dynamic Compressive Loading

Plasticity and damage analysis of metal hollow sphere structures under dynamic compressive loading

2012 ◽  
Vol 3 (2) ◽  
pp. 101-117
Author(s):  
Luiz Antônio Bragança da Cunda ◽  
Branca Freitas de Oliveira ◽  
Guillermo Juan Creus
Keyword(s):  
Hollow Sphere ◽  
Compressive Loading ◽  
Damage Analysis ◽  
Dynamic Compressive Loading

Chondrons from articular cartilage: I. Immunolocalization of type VI collagen in the pericellular capsule of isolated canine tibial chondrons

1988 ◽  
Vol 90 (4) ◽  
pp. 635-643 ◽  
Author(s):  
C.A. Poole ◽  
S. Ayad ◽  
J.R. Schofield
Keyword(s):  
Articular Cartilage ◽  
Polyclonal Antibody ◽  
Compressive Loading ◽  
Rabbit Serum ◽  
Staining Reaction ◽  
Normal Rabbit Serum ◽  
Type Vi Collagen ◽  
Tibial Cartilage ◽  
Heterogenous Population ◽  
Dynamic Compressive Loading

A heterogenous population of intact chondrons extracted from low-speed homogenates of canine tibial cartilage were stained by indirect immunofluorescence methods with a polyclonal antibody to type VI collagen. In each of the four chondron groups examined, anti-(type VI collagen) anti-serum was concentrated in the capsule immediately adjacent to the chondrocyte complex. A constant but weaker fluorescent reaction persists in ‘tail-like’ extensions common to single and double chondrons and in the medial connections between adjacent chondrons in linear columns and aggregated clusters. Frayed collagen bundles typical of chondron preparations did not react with the antibody. Similarly, chondrons reacted with normal rabbit serum, or treated by type VI collagen extraction procedures, showed no staining reaction. The differential localization of type VI collagen in the pericellular capsule is discussed in relation to the maintenance of the chondron's integrity and to the protection of the chondrocyte during dynamic compressive loading.

Dynamic compressive loading influences degradation behavior of PEG-PLA hydrogels

2009 ◽  
Vol 102 (3) ◽  
pp. 948-959 ◽  
Author(s):  
G.D. Nicodemus ◽  
K.A. Shiplet ◽  
S.R. Kaltz ◽  
S.J. Bryant
Keyword(s):  
Compressive Loading ◽  
Degradation Behavior ◽  
Dynamic Compressive Loading
Sign in / Sign up

Export Citation Format

Share Document