Sliding microindentation fracture of brittle materials: Role of elastic stress fields

1998 ◽  
Vol 29 (3-4) ◽  
pp. 143-152 ◽  
Author(s):  
Y. Ahn ◽  
T.N. Farris ◽  
S. Chandrasekar
Keyword(s):  
Elastic Stress ◽  
Brittle Materials ◽  
Stress Fields

The Microstructural Criterion for Creep Strength Breakdown in a 10%Cr Martensitic Steel

2016 ◽  
Vol 879 ◽  
pp. 465-470
Author(s):  
Nadezhda Dudova ◽  
Roman Mishnev ◽  
Rustam Kaibyshev
Keyword(s):  
Creep Strength ◽  
Elastic Stress ◽  
Martensitic Steel ◽  
Microstructural Characterization ◽  
Stress Fields ◽  
Tempered Martensite ◽  
Structure Boundary ◽  
Lath Structure

A 10%Cr martensitic steel with 3%Co and 0.008%B tempered at 770°C exhibits no creep strength breakdown at a temperature of 650°C up to an extremely high rupture time of ∼4×104 h under an applied stress of 120 MPa. The minimum creep rate was ∼3×10-11 s-1. Microstructural characterization showed that superior creep resistance associated with a high stability of tempered martensite lath structure. Boundary M23(B⋅C)6 phase particles are highly stable against coarsening under long-term aging and creep conditions. These particles retain their orientation relationship with ferritic matrix unchanged under creep at a temperature of 650°C. As a result, no migration of lath boundaries and their transformation to subboundaries diminishing the long-range elastic stress fields take place. The role of M(C,N) carbonitrides in achieving extraordinary high creep strength consists in hindering the knitting reaction between mobile lattice dislocations and lath boundaries.

The role of elasticity in thixotropy: Transient elastic stress during stepwise reduction in shear rate

2021 ◽  
Vol 33 (3) ◽  
pp. 033112
Author(s):  
Jiho Choi ◽  
Matthew Armstrong ◽  
Simon A. Rogers
Keyword(s):  
Shear Rate ◽  
Elastic Stress ◽  
Stepwise Reduction

scholarly journals The role of local plasticity in the redistribution of stress fields caused by in-service fatigue overloads

2020 ◽  
Vol 28 ◽  
pp. 2386-2389
Author(s):  
Jesús Toribio ◽  
Miguel Lorenzo ◽  
Diego Vergara ◽  
Leticia Aguado
Keyword(s):  
Stress Fields ◽  
Local Plasticity

ION BEAM (Cu–Pb–Sn) IMPLANTATION OF SURFACE LAYER OF 30ChGSN2A

2018 ◽  
Vol 25 (07) ◽  
pp. 1950011
Author(s):  
YU. M. BOROVIN ◽  
E. V. LUKYANENKO ◽  
V. V. OVCHINNIKOV ◽  
T. YU. SKAKOVA ◽  
N. V. UCHEVATKINA ◽  
...  
Keyword(s):  
Surface Layer ◽  
Elastic Stress ◽  
Ion Beam ◽  
Stress Fields ◽  
Internal Stresses ◽  
Lead Alloy ◽  
Mechanism Of Formation ◽  
Rotational Deformation ◽  
Multi Level ◽  
Copper Lead

Electron microscopy studies were conducted for the fine structure of ion-doped layer on 30ChGSN2A steel obtained by ion implantation of monotectic tin-doped copper–lead alloy Cu64Pb36[Formula: see text]Sn. Formation of a multi-level hierarchical structure was detected. The features of formation of each layer were analyzed, and it was found that the main mechanism of formation of these structures is diffusion and relaxation resulting in the occurrence of internal stresses both in the surface layer and in the sheet of 30ChGSN2A steel. Relaxation of elastic stress fields results in translational–rotational deformation forming various vortex structures.

A Study of the Role of Heterogeneities in the Initial Stages of Corrosion of Glazes Using Dynamic Imaging Microellipsometry (DIM)

1996 ◽  
Vol 462 ◽  
Author(s):  
B.E. McCarthy ◽  
P.B. Vandiver ◽  
J. Kruger
Keyword(s):  
Residual Stress ◽  
Dynamic Imaging ◽  
Corrosion Process ◽  
Ceramic Production ◽  
Stress Fields ◽  
Process Dynamic ◽  
Glazed Ceramic ◽  
Mechanical Factors

ABSTRACTCommon processes used in glazed ceramic production often result in a glaze with a heterogeneous microstructure. Heterogeneities may be due to residual batch materials, intentionally added colorants and opacifiers and/or the products of devitrification and phase separation. To study the effect of heterogeneities in the corrosion process, dynamic imaging microellipsometry was used in-situ in aqueous solutions to measure spatially and temporally resolved changes in the surface of glasses (model glazes). The measurements showed increased durability near inclusions. Residual stress fields surrounding the heterogeneities influenced the results. Decoupling of chemical and mechanical factors causing this increased durability was not possible.

Sign in / Sign up

Export Citation Format

Share Document