Drop-weight impact behaviors of 3-D angle interlock woven composites after thermal oxidative aging

2017 ◽  
Vol 166 ◽  
pp. 239-255 ◽  
Author(s):  
Mingling Wang ◽  
Miao Cao ◽  
Hailou Wang ◽  
Amna Siddique ◽  
Bohong Gu ◽  
...  
Keyword(s):  
Woven Composites ◽  
Oxidative Aging ◽  
Drop Weight ◽  
Weight Impact ◽  
Thermal Oxidative Aging

Temperature Effect on Drop-Weight Impact of Hybrid Woven Composites

2010 ◽  
Author(s):  
Yougashwar Budhoo ◽  
Benjamin Liaw ◽  
Feridun Delale ◽  
Ramki Iyer
Keyword(s):  
Finite Element ◽  
Hybrid Composites ◽  
Damage Model ◽  
Woven Composites ◽  
Effect Of Temperature ◽  
Composite Panels ◽  
Finite Element Software ◽  
Dynamic Finite Element ◽  
Drop Weight ◽  
Weight Impact

This paper investigates the effect of temperature on hybrid and non-hybrid woven composite panels (100mm×100mm×6.35mm) drop-weight impacted at five different temperatures:−60°C,−20°C, room temperature (R.T), 75°C and 125°C. The studies were conducted by combining experimental and 3-D dynamic finite element (FE) approaches. The specimens tested were made of plain-weave hybrid S2 glass-IM7graphite fibers/toughened epoxy. The composite panels were damaged using an instrumented drop-weight impact tester equipped with an environmental chamber for temperature control. The time-histories of impact-induced dynamic strains and impact forces were recorded. The damaged specimens were inspected visually and using the ultrasonic C-scan method. A 3-D dynamic finite element software package, with Chang-Chang composite damage model, was then used to simulate the experimental results of the drop-weight tests. Good agreement between experimental and FE results has been achieved. It is observed that the variation of results obtained from our experiments for the hybrid composites was very small (about 8%) when compared to those of non-hybrid composites. Also, when looking at the hybrid or non-hybrid composite, the effect of temperature at −60°C, −20°C was not significant whereas at 75°C and 125°C the results were more distinct.

Drop-weight impact damage of three-dimensional angle-interlock woven composites

2012 ◽  
Vol 47 (18) ◽  
pp. 2193-2209 ◽  
Author(s):  
B Sun ◽  
R Zhang ◽  
Q Zhang ◽  
R Gideon ◽  
B Gu
Keyword(s):  
Impact Damage ◽  
Three Dimensional ◽  
Woven Composites ◽  
Drop Weight ◽  
Weight Impact

scholarly journals Drop weight impact measurements of HE sensitivity: modified detection methods

2014 ◽  
Vol 500 (18) ◽  
pp. 182033 ◽  
Author(s):  
D N Preston ◽  
G W Brown ◽  
B C Tappan ◽  
D M Oshwald ◽  
J R Koby ◽  
...  
Keyword(s):  
Detection Methods ◽  
Drop Weight ◽  
Weight Impact

EV Systems for NR. II. Further Development of Curing Systems and Vulcanizate Properties

1969 ◽  
Vol 42 (2) ◽  
pp. 418-440 ◽  
Author(s):  
R. M. Russell ◽  
T. D. Skinner ◽  
A. A. Watson
Keyword(s):  
Thermal Stability ◽  
Zinc Oxide ◽  
Fatigue Cracking ◽  
Oxide System ◽  
Oxidative Aging ◽  
Thermal Oxidative Aging ◽  
Further Development ◽  
Resistance To Heat ◽  
Thermal Stability Of ◽  
Simple Network

Abstract It was shown in Part I that the use of EV systems in NR provides a simple network in which the crosslinks are mainly monosulfidic. Part II describes in some detail the properties of vulcanizates obtained by the use of EV systems and their relationship to conventional and TMTD-zinc oxide cured vulcanizates. The disadvantages of short scorch time and heavy bloom which accompany the TMTD-zinc oxide system are overcome by the new EV systems. The monosulfidic network obtained by the use of EV systems confers on NR good overall physical properties together with much improved resistance towards thermal and thermal oxidative aging. The thermal stability of this type of network is reflected in the outstanding resistance of the vulcanizates to set and reversion, and their good resistance to heat build-up under dynamic conditions. Vulcanizates derived from EV systems have increased resistance to thermal oxidative aging due to the inherent thermal stability of the networks and good response to antioxidant protection. This increased resistance results in much better retention of tensile properties, tear resistance and fatigue cracking resistance on aging, relative to that of conventionally cured vulcanizates.

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