Topic
Fractography
About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.
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TL;DR: In this article, the influence of particles and solutes on the strength, work-hardening behavior and ductile fracture of four different aluminium alloys in the as-cast and homogenised condition is investigated.
52 citations
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TL;DR: Fractography is critical to failure analysis of metals and polymers as discussed by the authors, and the key fractographic features for metals and plastics are described in this paper, including stress raisers, microstructure, material defects, and thermomechanical history.
Abstract: Fractography is critical to failure analysis of metals and plastics. Fractography of plastics is a relatively new field with many similarities to metals. Using case histories, various aspects of failure analysis and fractography of metals and plastics are compared and contrasted. Failure modes common to both metals and plastics include ductile overload, brittle fracture, impact, and fatigue. Analogies can also be drawn between stress-corrosion cracking (SCC) of metals and stress cracking of polymers. Other metal/plastic failure analogies include corrosion/chemical aging, dealloying/scission, residual stress/frozen-in stress, and welds/knit lines. Stress raisers, microstructure, material defects, and thermomechanical history play important roles in both types of materials. The key fractographic features for metals and plastics are described in this paper.
52 citations
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01 Feb 2012-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effects of steam environment on fatigue behavior of a non-oxide ceramic composite with a multilayered matrix were investigated at 1200°C, where the composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide reinforced with laminated woven Hi-Nicalon™ fibers.
Abstract: Effects of steam environment on fatigue behavior of a non-oxide ceramic composite with a multilayered matrix were investigated at 1200 °C. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated woven Hi-Nicalon™ fibers. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. Tensile stress–strain behavior and tensile properties were evaluated at 1200 °C. Tension-tension fatigue tests were conducted at 0.1 Hz and at 1.0 Hz for fatigue stresses ranging from 100 to 140 MPa in air and in steam. Fatigue run-out was defined as 105 cycles at 0.1 Hz and as 2 × 105 cycles at 1.0 Hz. Presence of steam had little influence on fatigue performance at 1.0 Hz, but noticeably degraded the fatigue lifetimes at 0.1 Hz. Specimens that achieved run-out were subjected to tensile tests to failure to characterize the retained tensile properties. Prior fatigue in air and in steam caused significant reduction in tensile strength and modulus. Composite microstructure, as well as damage and failure mechanisms were investigated.
52 citations
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TL;DR: In this paper, the deformation behavior of niobium-hydrogen alloys was investigated in the temperature range 125-500°C and at compositions up to H Nb of 0.9.
52 citations
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TL;DR: In this article, the authors investigated a first stage turbine blade failure in a 6.5MW gas turbine and found that overheating was the main reason of the blade failure, and the fracture surface exhibits the local melting occurred and re-solidified in the leading edge.
52 citations