scholarly journals Rheological Model to Describe the Cyclic Load-Bearing Behaviour of Strain-Hardening Cement-Based Composites (SHCC)

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6444
Author(s):  
Dominik Junger ◽  
Steffen Müller ◽  
Viktor Mechtcherine
Keyword(s):  
Cyclic Loading ◽  
Experimental Evidence ◽  
Strain Hardening ◽  
Mechanical Behaviour ◽  
Rheological Model ◽  
Cyclic Load ◽  
Tensile Loading ◽  
Load Bearing ◽  
Rheological Modelling ◽  
The Subject

The mechanical behaviour of strain-hardening cement-based composites (SHCC) under monotonic tensile loading has been the subject of research for many years. The recent research on the SHCC’s performance under cyclic loading has enabled the identification of a wide variety of damage phenomena different to those observed under monotonic loading. The article at hand first summarises the experimental evidence of such phenomena in the context of the material performance observed. On this basis, the mechanisms behind these phenomena are discussed and explained using rheological modelling.

Derivation of strain hardening in cyclic loading from that in tensile loading

2001 ◽  
Vol 81 (11) ◽  
pp. 727-732 ◽  
Author(s):  
T.H. Lin ◽  
H. Q. Liu ◽  
N. G. Liang ◽  
N. J. Teng
Keyword(s):  
Cyclic Loading ◽  
Strain Hardening ◽  
Tensile Loading

scholarly journals The Functional Performance of Poly Methylmethacrylate Orthopaedic Bone Cement

2000 ◽  
Author(s):  
Patrick J. Prendergast
Keyword(s):  
Cyclic Loading ◽  
Bone Cement ◽  
Human Body ◽  
Damage Accumulation ◽  
Cyclic Load ◽  
Functional Performance ◽  
Extended Period ◽  
Implant Loosening ◽  
Revision Operation ◽  
Load Bearing

Abstract Materials for fixation of load-bearing implants in the human body should be able to sustain a cyclic load of variable magnitude over an extended period over the remaining lifetime of the parient. A material commonly used for fixation of orthopaedic, dental, and maxillofacial implants is a polymer poly methylmethacrylate (PMMA). However, PMMA does not ideally fulfill this criterion because it undergoes damage accumulation and creep under cyclic loading. This leads to implant loosening and the need for a revision operation.

STRENGTHENING OF RC BEAMS SUBJECTED TO CYCLIC LOAD USING ULTRA HIGH-PERFORMANCE STRAIN HARDENING CEMENTITIOUS COMPOSITES

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Abd El-Hakim Khalil ◽  
Emad Etman ◽  
Ahmed Atta ◽  
Mohamed Essam
Keyword(s):  
Cyclic Loading ◽  
Strain Hardening ◽  
High Performance ◽  
Cyclic Load ◽  
Large Strain ◽  
Dissipated Energy ◽  
Cementitious Composites ◽  
Concrete Members ◽  
Protective Performance ◽  
Early Strain

Ultra High-Performance Strain Hardening Cementitious Composites (UHP-SHCC) is a composite material comprising a cement-based matrix and short fibers with outstanding mechanical and protective performance having advantages as large strain capacity as well as high compressive and tensile strength, which is useful for strengthening or repair concrete members. In the present study, five specimens were tested experimentally, one as a control and four strengthened with 40 mm thickness of UHP-SHCC layer attached from tension side with variable reinforcement ratios embedded in strengthening layer. Cyclic loading was applied to all specimens. The test results showed the importance of reinforcing the UHP-SHCC to eliminate the observed early strain localization and to gain adequate dissipated energy under cyclic loading. It is also proved that using an unreinforced UHP-SHCC layer for strengthening may lead to a brittle failure especially in case of cyclic load.

THE STRENGTH OF SUBMICRON-SIZED MATERIALS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3579-3586 ◽  
Author(s):  
A. H. W. NGAN ◽  
P. C. WO ◽  
L. ZUO ◽  
H. LI ◽  
N. AFRIN
Keyword(s):  
Yield Strength ◽  
Time Dependence ◽  
Experimental Evidence ◽  
Mechanical Behaviour ◽  
Survival Probability ◽  
Diffusion Length ◽  
Theoretical Explanation ◽  
Atomistic Simulations ◽  
Load Range ◽  
Scaling Model

Recent rapid advancements in nano- and micro-machinery technologies call for an urgent need to understand the mechanical behaviour of materials of dimensions in the sub-micron regime. The initial yield strength of submicron crystals exhibits remarkable statistical scatter as well as dependence upon size and time under load. Submicron-sized materials are also found to creep many orders of magnitude faster than bulk counterparts. In this paper, the recent experimental evidence for these phenomena is reviewed. Theoretical explanation of these phenomena is also discussed. The statistical scatter and time dependence of the yield strength are interpreted by a scaling model derived from atomistic simulations. The results indicate that, within a certain load range, the strength of a sub-micron sized material is not deterministic and can only be described by a survival probability. The much faster creep in the submicron regime is interpreted in terms of the much shorter diffusion length compared to bulk creep.

In Vitro Stain Transport in Canaliculi of Rat Femora Under Cyclic Loading

2000 ◽  
Author(s):  
Bixia Li ◽  
Timothy L. Norman
Keyword(s):  
Fluid Flow ◽  
Cyclic Loading ◽  
Confocal Microscopy ◽  
Mechanical Loading ◽  
Cyclic Load ◽  
Flow Behavior ◽  
Load Level ◽  
Static Conditions ◽  
Rat Bone

Abstract In this study, rat femurs were used to test the diffusion and mechanical transport properties of a fluroscein stain tracer in microvessels of bone. Fluroscein was used as a tracer to visualize the fluid flow behavior using confocal microscopy. It was found that stain transport occurs due to diffusion under static conditions and due to mechanical loading. The transport increased with cyclic load level and frequency. Our results also show that stain transport at the canaliculi level occurs rapidly in rat bone.

Mechanical behaviour of Bioactive Glass granules and morselized cancellous bone allograft in load bearing defects

2016 ◽  
Vol 49 (7) ◽  
pp. 1121-1127 ◽  
Author(s):  
D.J.W. Hulsen ◽  
J. Geurts ◽  
N.A.P. van Gestel ◽  
B. van Rietbergen ◽  
J.J. Arts
Keyword(s):  
Bioactive Glass ◽  
Cancellous Bone ◽  
Mechanical Behaviour ◽  
Bone Allograft ◽  
Load Bearing ◽  
Bearing Defects

scholarly journals The Effect of Vertical Loads and the Pile Shape on Pile Group Response under Lateral Two-Way Cyclic Loading

2019 ◽  
Vol 5 (11) ◽  
pp. 2377-2391
Author(s):  
Aseel Kahlan Mahmood ◽  
Jasim M Abbas
Keyword(s):  
Cyclic Loading ◽  
Cyclic Load ◽  
Lateral Displacement ◽  
Load Ratio ◽  
Pile Group ◽  
Pile Groups ◽  
Group Response ◽  
Load Intensity ◽  
Number Of Cycles ◽  
Aluminum Pipe

This paper is presented the lateral dynamic response of pile groups embedded in dry sand under influence of vertical loads and the pile shape in-group, which are subjected to the lateral two-way cyclic loads. The laboratory typical tests with pile groups (2×1) have an aluminum-pipe (i.e. circular, square) pile, embedded length to diameter of pile ratio (L/D=40) and spacing to diameter ratio (S/D) of 3, 5, 7 and 9 are used with different cyclic-load ratio (CLR) 0.4, 0.6 and 0.8. The experimental results are revealed that both the vertical and lateral pile capacity and displacement is significantly affected by the cyclic-loading factors i.e. (number of cycles, cyclic load ratio, and shape of pile) .In this study, important design references are presented. Which are explained that the response of the pile groups under cyclic lateral loading are clear affected by the attendance of vertical load and pile shape. Where, it is reduction the lateral displacement of group piles head and increase lateral capacity about (50) % compared without vertical loads. On the other side, the pile shape is a well affected to the pile response where the level of decline in lateral displacement at the pile groups head in the square pile is more than circular pile about 20 % at the same load intensity.

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