Influence ofR-curve behaviour on strength degradation due to Hertzian indentation

1996 ◽  
Vol 31 (9) ◽  
pp. 2379-2384 ◽  
Author(s):  
S. Widjaja ◽  
J. E. Ritter ◽  
K. Jakus
Keyword(s):  
Strength Degradation ◽  
Hertzian Indentation

Hertzian Indentation Damage Behavior of Highly Porous Silicon Nitrides

2007 ◽  
Vol 544-545 ◽  
pp. 339-342
Author(s):  
Hong Zeng ◽  
Hong Jie Wang ◽  
Dan Bo Lin ◽  
Yu Bai ◽  
Guan Jun Qiao ◽  
...  
Keyword(s):  
Strength Degradation ◽  
Bending Tests ◽  
Damage Behavior ◽  
Hertzian Indentation ◽  
Three Point Bending ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Highly Porous ◽  
Porous Si3n4 Ceramics ◽  
Indentation Damage

Highly porous Si3N4 ceramics in service are usually subjected to continuous impact of solid particles which may give rise to localized damage and consequently to strength degradation. Hertzian indentation and three-point bending tests were conducted to investigate the contact damage behavior of highly porous Si3N4 ceramics in this paper. The Hertzian indentation damage morphologies were examined by using a bonded-interface technique. As a result of intragranular microfracture under Hertzian indentation, a distributed subsurface damage region is developed beneath the indenter. It was shown that, with increasing indentation load, the damage region extends progressively and a quasi-plastic stress-strain response exhibits. Failure sources were observed to be Hertzian indentation sites in three-point bending tests, leading to a gradual strength degradation.

Oxidation behaviour and strength degradation of a Yb 2 O 3 -SiO 2 -doped hot-pressed silicon nitride between 1200 and 1500°C

2002 ◽  
Vol 82 (16) ◽  
pp. 3027-3043 ◽  
Author(s):  
Shuqi Guo ◽  
Naoto Hirosaki ◽  
Toshiyuki Nishimura ◽  
Yoshinobu Yammoto ◽  
Mamoru Mitomo
Keyword(s):  
Silicon Nitride ◽  
Strength Degradation ◽  
Oxidation Behaviour

Enhanced Method of Predicting Tensile Strength Degradation of Steel Bridge Members Due to Corrosion

2012 ◽  
Vol 2 (1) ◽  
pp. 30-41
Author(s):  
J. M.R.S. Appuhamy ◽  
M. Ohga ◽  
T. Kaita ◽  
P. Chun ◽  
P. B.R. Dissanayake
Keyword(s):  
Tensile Strength ◽  
Strength Degradation ◽  
Steel Bridge

Strength degradation of lightguide fibres in room temperature water

1996 ◽  
Vol 32 (8) ◽  
pp. 761 ◽  
Author(s):  
C.R. Kurkjian ◽  
M.J. Matthewson
Keyword(s):  
Room Temperature ◽  
Strength Degradation ◽  
Temperature Water

Experimental Study on Steel Frames Infilled with Sandwich Composite Panels

2011 ◽  
Vol 243-249 ◽  
pp. 499-505
Author(s):  
Can Xing Qiu ◽  
He Tao Hou ◽  
Wei Long Liu ◽  
Ming Lei Wu
Keyword(s):  
Seismic Design ◽  
Steel Frames ◽  
Strength Degradation ◽  
Hysteretic Behavior ◽  
Sandwich Composite ◽  
Viscous Damping ◽  
Test Results ◽  
Ductility Index ◽  
Damage Process ◽  
Seismic Behaviors

A model of full scale one-bay, one storey was tested under low cyclic loading in order to study the hysteretic behavior of steel frames with sandwich composite (SC) panels. According to the failure pattern and damage process of test specimen, seismic behaviors were evaluated. Hysterics loops, skeleton curves, curves of strength degradation, and curves of stiffness degradation, ductility index and viscous damping coefficient were analyzed. Test results show that the failures of panels mainly occurred around the embedded parts, but compared with traditional panels and walls, SC panels exhibit a better integration. The connection between panel and steel frame is vital to the mutual work of the two parts. Finally, seismic design recommendations based on the analysis of ductility index and energy dissipation of the structures are presented.

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