On the relation between texture perception and fundamental mechanical parameters for liquids and time dependent solids

2002 ◽  
Vol 13 (4) ◽  
pp. 227-236 ◽  
Author(s):  
Ton van Vliet
Keyword(s):  
Time Dependent ◽  
Mechanical Parameters ◽  
Texture Perception

Investigating Time Dependent Mechanical Properties of Epoxy with Nano Particles by Using Indentation Tests

2012 ◽  
Vol 562-564 ◽  
pp. 52-55
Author(s):  
Guo Wei Ruan ◽  
Ming Chen Chuang ◽  
Hsing Han Yen ◽  
Chin Tu Lu ◽  
Nai Shang Liou
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Epoxy Composite ◽  
Constitutive Models ◽  
Relaxation Effect ◽  
Nano Particles ◽  
Time Dependent ◽  
Mechanical Parameters ◽  
Indentation Tests ◽  
Finite Element Procedure

The objective of this study was to examine the time dependent mechanical properties of epoxy without/with nano particles composites and how the nano particles in the epoxy affect the relaxation properties of epoxy. Furthermore, viscoelastic constitutive models of epoxy and epoxy composite were established and the corresponding mechanical parameters were obtained by using inverse iterative finite element procedure. The ramp-hold indentation tests were used to investigate the time dependent mechanical properties of epoxy with and without Al2O3 nano particles. Experimental results showed that adding Al2O3 nano particles in to epoxy can reduce the relaxation effect of epoxy.

scholarly journals Cell Wall Biochemistry Drives Pollen Tube Mechanics and Affects Growth Rate

2021 ◽  
Author(s):  
Hannes Vogler ◽  
Gautam Munglani ◽  
Tohnyui Ndinyanka Fabrice ◽  
Christian Draeger ◽  
Jan Thomas Burri ◽  
...  
Keyword(s):  
Growth Rate ◽  
Cell Wall ◽  
Pollen Tube ◽  
Turgor Pressure ◽  
Time Dependent ◽  
Mechanical Parameters ◽  
Cell Wall Elasticity ◽  
Simulation Techniques ◽  
The Right ◽  
First Time

Pollen tubes live a life on a razor′s edge. They must maintain cell wall integrity whilst growing towards the ovule at extraordinary speed but explosively burst at just the right moment to release the sperm cells—with fatal consequences for reproduction if things go wrong. The precisely controlled growth of the pollen tube depends on the fine-tuned balance between the expansive force of turgor pressure and the restraining effect of the cell wall. Currently, it is not well understood how the composition of the cell wall affects its mechanical properties. Using Arabidopsis mutants, we have investigated these interactions by combining experimental and simulation techniques to determine instantaneous and time-dependent mechanical parameters. This allowed, for the first time, the quantification of the effects of cell wall biochemistry on turgor pressure and cell wall elasticity and to predict their effects on growth rate. Our systems biology approach is widely applicable to study the implications of mechanical stress on growth.

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