scholarly journals Predictive Service Life Tests for Roofing Membranes: Phase II Investigation of Accelerated Aging Tests for Tracking Degradation of Roofing Membrane Materials

2002 ◽  
Author(s):  
David M. Bailey ◽  
Carl G. Cash ◽  
Arthur G. Davies
Keyword(s):  
Service Life ◽  
Phase Ii ◽  
Accelerated Aging ◽  
Membrane Materials ◽  
Life Tests

Service Life Prediction for the Neoprene Used in Seawater

2013 ◽  
Vol 739 ◽  
pp. 85-89
Author(s):  
Qing Zhen Wen ◽  
Chao Yu ◽  
Jin Hua Zhu
Keyword(s):  
Service Life ◽  
Aging Time ◽  
Life Prediction ◽  
Sea Water ◽  
Accelerated Aging ◽  
Service Life Prediction ◽  
Exponential Form ◽  
Prediction Functions

The heat seawater method was designed and the accelerated aging tests of the neoprene were carried in laboratory. The toughness and strength of the neoprene in aging time was investigated. The rule of toughness and strength and aging time was studied. The service life prediction functions of the neoprene were established and service life at 25°C was estimated based on the index of toughness and strength. It is concluded that toughness and strength of the neoprene decreases in exponential form with aging time, and the service life of the neoprene used in sea water at 25°C is 29.5 years.

Update: Service Life Tests for Roofing Membranes

2008 ◽  
pp. 136-136-8 ◽  
Author(s):  
DM Bailey ◽  
CG Cash ◽  
AG Davies
Keyword(s):  
Service Life ◽  
Life Tests

Hygro-Mechanical Durability of Underfilled Flip-Chip-on-Board (FCOB) Interconnects

2002 ◽  
Vol 124 (3) ◽  
pp. 184-187 ◽  
Author(s):  
J. H. Okura ◽  
A. Dasgupta ◽  
J. F. J. M. Caers
Keyword(s):  
Flip Chip ◽  
Failure Modes ◽  
Moisture Absorption ◽  
Accelerated Aging ◽  
Accelerated Life Tests ◽  
Accelerated Life ◽  
Service Durability ◽  
Mechanical Durability ◽  
Life Tests ◽  
And Diffusion

The effect of constant temperature and humidity environments on the durability of interconnects in underfilled Flip-Chip-on-Board (FCOB) assemblies is investigated in this study. Polymeric underfills, used to enhance thermomechanical durability of the interconnects, are found to create new failure modes due to hygromechanical swelling. Based on experimental observations, the failure mechanism is hypothesized to be cracking of intermetallics, which have weakened due to thermal aging. Pseudo 3-D finite element analyses are conducted to quantify the moisture absorption and diffusion through the polymeric underfill, and the resulting hygromechanical viscoplastic stress history. The simulations are combined with accelerated aging tests to assess in-service durability in hot, humid environments. Model predictions are compared with results of accelerated life tests available in the literature.

Land-Saving Mode of Congo (Brazzaville) Highway One (Phase II)

2012 ◽  
Vol 256-259 ◽  
pp. 1832-1836
Author(s):  
Jing Shi ◽  
Jin Hua Tan ◽  
Nian Zhou
Keyword(s):  
Service Life ◽  
Literature Review ◽  
Traffic Flow ◽  
Phase Ii ◽  
Road Construction ◽  
Cultivated Land ◽  
Turning Radius ◽  
Saving Mode ◽  
Congo Brazzaville ◽  
Land Saving

Plenty of cultivated land has been used for highway construction. Thus Land-saving mode in road construction has drawn more and more attentions. However, inappropriate land-saving mode may result in some kinds of risks during highway's service life. Based on road risk, this paper discusses land-saving mode of Congo (Brazzaville) Highway One (Phase Ⅱ), trying to reach the balance between the two after accomplishing literature review and analyzing the prediction of traffic flow. The result shows that, the project should choose the mode such as proper construction scale and high bridge & tunnel ratio, rather than small turning radius and low roadbed.

Service Life Prediction for the Neoprene Based on Tearing Strength

2011 ◽  
Vol 328-330 ◽  
pp. 1090-1093 ◽  
Author(s):  
Chao Yu ◽  
Qing Zhen Wen ◽  
Jin Hua Zhu ◽  
Zheng Wei
Keyword(s):  
Service Life ◽  
Aging Time ◽  
Life Prediction ◽  
Sea Water ◽  
Accelerated Aging ◽  
Service Life Prediction ◽  
Exponential Form ◽  
Prediction Function ◽  
Gradual Process ◽  
Tearing Strength

The degradation of neoprene often occurs as a slow and gradual process and it is cannot be used abruptly. In order to keep the safety of equipments and people, it is important to consider the development of such process to correctly estimate its service life. The heat seawater method was designed and the accelerated aging tests of the neoprene were carried in laboratory. The tearing strength of the neoprene in aging time was investigated. The rule of tearing strength and aging time was studied. The service life prediction function of the neoprene was established and service life at 25°C was estimated based on the index of tearing strength. The result shows that tearing strength of the neoprene decreases in exponential form with aging time, and the service life of the neoprene used in sea water at 25°C is 29.79 years.

Effect of Moisture on Durability of Flip-Chip-on-Board (FCOB) Interconnects

2000 ◽  
Author(s):  
J. H. Okura ◽  
A. Dasgupta ◽  
J. F. J. M. Caers
Keyword(s):  
Flip Chip ◽  
Failure Modes ◽  
Moisture Absorption ◽  
Accelerated Aging ◽  
Accelerated Life Tests ◽  
Accelerated Life ◽  
Model Predictions ◽  
Service Durability ◽  
Life Tests ◽  
And Diffusion

Abstract The effect of constant temperature and humidity environments on the durability of interconnects in underfilled Flip-Chip-on-Board (FCOB) assemblies is investigated in this study. Polymeric underfills, used to enhance thermomechanical durability of the interconnects, are found to create new failure modes due to hygromechanical swelling. Based on experimental observations, the failure mechanism is hypothesized to be cracking of intermetallics, which have weakened due to thermal aging. Pseudo 3-D finite element analyses are conducted to quantify the moisture absorption and diffusion through the polymeric underfill, and the resulting hygromechanical viscoplastic stress history. The simulations are combined with accelerated aging tests to assess in-service durability in hot, humid environments. Model predictions are compared with results of accelerated life tests available in the literature.

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