scholarly journals Strain Rate Effects in the Mechanical Response of Polymer-Anchored Carbon Nanotube Foams

2009 ◽  
Vol 21 (3) ◽  
pp. 334-338 ◽  
Author(s):  
Abha Misra ◽  
Julia R. Greer ◽  
Chiara Daraio
Keyword(s):  
Carbon Nanotube ◽  
Strain Rate ◽  
Mechanical Response ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Polymer Anchored

Strain Rate Effects on Hydrogen Embrittlement Characteristics of Notched 4340 Steel

2014 ◽  
Vol 1650 ◽  
Author(s):  
Mobbassar Hassan Sk ◽  
Ruel A Overfelt
Keyword(s):  
Hydrogen Embrittlement ◽  
Brittle Fracture ◽  
Strain Rate ◽  
Intergranular Fracture ◽  
Mechanical Response ◽  
Strain Rate Effects ◽  
Grain Sizes ◽  
4340 Steel ◽  
Rate Effects

ABSTRACTThe effect of strain rate on hydrogen embrittlement of low alloy 4340 steel was studied using double-notched tensile samples electrochemically charged in-situ with hydrogen in 1N H2SO4 + 5 mg/l As2O3 solution. The mechanical response of samples with prior austenitic grain sizes of 10 and 40 μm and martensitic hardness of 43-52 HRC were examined after hydrogen charging times of 0-20 min. Increasing the strain rate for hydrogen charged samples resulted in decreased failure strains and increased evidence of brittle fracture. Brittle fracture surfaces for the harder samples showed primarily intergranular fracture while softer samples exhibited predominantly quasi-cleavage.

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