Hygrothermal Aging Effect on Firing and Corrosion Behavior of Fuse-Head Used for Electric Explosive Device

2009 ◽  
Author(s):  
Youhong Zhang ◽  
Rui Zhang ◽  
Enyi Chu ◽  
Shenli Zhou ◽  
Jupeng Liu
Keyword(s):  
Corrosion Behavior ◽  
Aging Effect ◽  
Hygrothermal Aging ◽  
Explosive Device

Hygrothermal aging effect on the properties of PMMA nanocomposites reinforced by ceramic nanoparticles

2021 ◽  
pp. 002199832110539
Author(s):  
Shervin Jodatnia ◽  
Samrand Rash-Ahmadi
Keyword(s):  
Electron Microscopy ◽  
Experimental Data ◽  
Mechanical Properties ◽  
Moisture Absorption ◽  
Aging Effect ◽  
Superior Performance ◽  
Multi Criteria Decision Making ◽  
Aging Effects ◽  
Hygrothermal Aging ◽  
Scanning Electron

This paper aimed to evaluate hygrothermal aging effects on polymethyl methacrylate modified with TiO2, SiO2, and Al2O3 nanoparticles in 0.5, 1, and 2% weight fractions. The distribution of nanoparticles was characterized by the scanning electron microscopy (SEM) method. Moisture absorption behavior and mechanical properties of samples in terms of elastic modulus, tensile strength, impact strength, and hardness were investigated. Furthermore, the coefficient of hygrothermal expansion (CHE) for each sample was calculated thanks to experimental data. Finally, by applying the multi-criteria decision making (MCDM) technique, the optimum composition for superior performance was obtained in 0.5 wt% of nanoparticles, more specifically for SiO2.

Aging Effect on Corrosion Damage Evolution Behavior of Fuse-Head Used for Electric Explosive Device

2012 ◽  
Vol 166-169 ◽  
pp. 1883-1886
Author(s):  
You Hong Zhang ◽  
Qian Zhang ◽  
Xin Long Chang ◽  
Chun Guo Yue ◽  
Shi Ying Zhang ◽  
...  
Keyword(s):  
Damage Evolution ◽  
Failure Modes ◽  
Experimental Studies ◽  
Corrosion Damage ◽  
Aging Effect ◽  
Factors Affecting ◽  
Temperature And Humidity ◽  
Explosive Device ◽  
Effects Of Temperature ◽  
Evolution Behavior

Degradation of mechanical properties of electric explosive device fuse-head was serious in different temperature and humidity environments. The objective of this study was to examine the effects of temperature and humidity aging on the damage evolution behavior of fuse-head used for electric explosive device. In this paper, the experimental studies were presented to appreciate the influence of humidity and temperature on the corrosion damage and firing of electric explosive device. The damage mechanisms and failure modes were determined through nondestructive evaluation. The explosive broken and corrosion damage on lead induced by temperature and humidity aging were the main factors affecting the firing probability. At last, the evolution rule of corrosion damage in the environment of different relative humidity and temperature was discussed.

Laser-Induced Thermoelastic Wave Technique to Evaluate Hygrothermal Aging in CFRP Composites

2021 ◽  
Vol 79 (1) ◽  
pp. 55-60
Author(s):  
Nilesh C Bagale ◽  
M R Bhat
Keyword(s):  
Composite Structures ◽  
Aging Effect ◽  
Fiber Reinforced Polymer ◽  
Mechanical Degradation ◽  
Fiber Reinforced ◽  
Thermoelastic Wave ◽  
Hygrothermal Aging ◽  
Reinforced Polymer ◽  
Novel Approach ◽  
Property Changes

The interaction of heat and moisture with fiber-reinforced polymer composites over a long duration is known to cause physical and mechanical degradation. In this paper, an attempt was made to evaluate physical and mechanical changes in carbon fiber–reinforced polymer (CFRP) by an unconventional nondestructive approach before and after varied duration of exposures to hygrothermal (HT) treatment at an elevated temperature (80 °C/353 K) up to 800 h. As a novel approach, laser-induced thermoelastic waves were utilized for characterization of the material. Wave characteristics, such as wave amplitude and velocity of propagation, were studied over different duration exposures of HT treatment to detect and quantify HT-induced property changes in the material. Results show that the aging effect attenuated the wave to a factor of 2.75 and significantly reduced the velocity of wave propagation by 20% compared to that of the pristine material, revealing the degradation in the material caused by HT exposure. The proposed methodology has the potential to monitor the health of fiber-reinforced polymer composite structures that have undergone hygrothermal aging.

Hygrothermal Aging Effect on Fatigue Behavior of GLARE

2008 ◽  
Vol 28 (20) ◽  
pp. 2487-2499 ◽  
Author(s):  
D.A. Da Silva ◽  
E.C. Botelho ◽  
M.C. Rezende
Keyword(s):  
Fatigue Behavior ◽  
Aging Effect ◽  
Hygrothermal Aging

Laser-Induced Thermoelastic Wave Technique to Evaluate Hygrothermal Aging in CFRP Composites

2021 ◽  
Vol 79 (1) ◽  
pp. 55-60
Author(s):  
Nilesh C. Bagale ◽  
M.R. Bhat
Keyword(s):  
Composite Structures ◽  
Aging Effect ◽  
Fiber Reinforced Polymer ◽  
Mechanical Degradation ◽  
Fiber Reinforced ◽  
Thermoelastic Wave ◽  
Hygrothermal Aging ◽  
Reinforced Polymer ◽  
Novel Approach ◽  
Property Changes

The interaction of heat and moisture with fiber-reinforced polymer composites over a long duration is known to cause physical and mechanical degradation. In this paper, an attempt was made to evaluate physical and mechanical changes in carbon fiber–reinforced polymer (CFRP) by an unconventional nondestructive approach before and after varied duration of exposures to hygrothermal (HT) treatment at an elevated temperature (80 °C/353 K) up to 800 h. As a novel approach, laser-induced thermoelastic waves were utilized for characterization of the material. Wave characteristics, such as wave amplitude and velocity of propagation, were studied over different duration exposures of HT treatment to detect and quantify HT-induced property changes in the material. Results show that the aging effect attenuated the wave to a factor of 2.75 and significantly reduced the velocity of wave propagation by 20% compared to that of the pristine material, revealing the degradation in the material caused by HT exposure. The proposed methodology has the potential to monitor the health of fiber-reinforced polymer composite structures that have undergone hygrothermal aging.

Sem Studies of Co-Cr-Mo Surgical Implant Alloy Corrosion Behavior

1982 ◽  
Vol 40 ◽  
pp. 520-521
Author(s):  
Ann Chidester Van Orden ◽  
John L. Chidester ◽  
Anna C. Fraker ◽  
Pei Sung
Keyword(s):  
Electron Microscopy ◽  
Corrosion Behavior ◽  
Anodic Polarization ◽  
Saline Solution ◽  
Saturated Calomel Electrode ◽  
Physiological Saline ◽  
X Ray ◽  
Physiological Saline Solution ◽  
Scanning Electron

The influence of small variations in the composition on the corrosion behavior of Co-Cr-Mo alloys has been studied using scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), and electrochemical measurements. SEM and EDX data were correlated with data from in vitro corrosion measurements involving repassivation and also potentiostatic anodic polarization measurements. Specimens studied included the four alloys shown in Table 1. Corrosion tests were conducted in Hanks' physiological saline solution which has a pH of 7.4 and was held at a temperature of 37°C. Specimens were mechanically polished to a surface finish with 0.05 µm A1203, then exposed to the solution and anodically polarized at a rate of 0.006 v/min. All voltages were measured vs. the saturated calomel electrode (s.c.e.).. Specimens had breakdown potentials near 0.47V vs. s.c.e.

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