127 Analytical Study on Stress Estimation Method by Dynamic Hardness

2001 ◽  
Vol 2001.14 (0) ◽  
pp. 53-54
Author(s):  
Satoshi HANAWA ◽  
Masahiro ISHIHARA ◽  
Tsuneo Takahashi
Keyword(s):  
Analytical Study ◽  
Estimation Method ◽  
Dynamic Hardness ◽  
Stress Estimation

scholarly journals Local stress fields in solids estimated by acoustical emission method

2021 ◽  
Vol 2103 (1) ◽  
pp. 012064
Author(s):  
V L Hilarov ◽  
E E Damaskinskaya
Keyword(s):  
Time Series ◽  
Acoustic Emission ◽  
Stress Field ◽  
Estimation Method ◽  
Local Stress ◽  
Stress Fields ◽  
Emission Method ◽  
Macroscopic Fracture ◽  
Stress Estimation ◽  
Kinetic Concept

Abstract Based on the Zhurkov’s kinetic concept of solids’ fracture a local internal stress estimation method is introduced. Stress field is computed from the time series of acoustic emission intervals between successive signals. For the case of two structurally different materials the time evolution of these stresses is examined. It is shown that temporal changes of these stresses’ accumulation law may serve as a precursor of incoming macroscopic fracture.

S1601-2-2 Stress estimation method based on multivariate analysis of physiological indices

2009 ◽  
Vol 2009.5 (0) ◽  
pp. 181-182
Author(s):  
Hirohito IDE ◽  
Masahiko OSADA ◽  
Guillaume LOPEZ ◽  
Masaki SHUZO ◽  
Jean-Jacques DELAUNAY ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Estimation Method ◽  
Physiological Indices ◽  
Stress Estimation

Reference Stress Estimation for Anisotropic Materials Using Linear Elastic Finite Element Results

2020 ◽  
Author(s):  
Brent Scaletta ◽  
Richard Green
Keyword(s):  
Finite Element ◽  
Turbine Blades ◽  
Estimation Method ◽  
Anisotropic Materials ◽  
Remaining Useful Life ◽  
Material Behavior ◽  
Initial Stress State ◽  
Reference Stress ◽  
Stress Estimation ◽  
Path Dependent

Abstract Components in the hot section of a gas turbine engine experience extended high temperature dwells and cycles composed of multiple starts, changes in load, and variable duration. These loading profiles can lead to damage from cyclic viscoplasticity which is heavily path dependent as dwell stress, yield strength, and stress range change constantly during operation. Since an accurate prediction of accumulated damage is critical to managing an engine, reduced order methods for tracking material behavior over complex operation cycles are necessary tools to help avoid unplanned down time and optimize cost over the operational period. One method for tracking the material behavior during path dependent cyclic viscoplasticity requires the use of reference stress. Reference stress is a bulk representative stress that can be used in conjunction with various lifing methodologies to determine component durability. Previous papers provided a method for calculating reference stress for isotropic materials using limit load estimation. The goal of this paper is to extend these methodologies to a reference stress estimation method for anisotropic materials to estimate life for single crystal turbine blades. Derived equations will be shown and results from simple Finite Element (FE) test cases will be discussed to demonstrate the accuracy of the anisotropic reference stress estimation. Once reference stress is obtained, the long term forward creep stress of a component can be estimated for any given initial stress state. This approach can be used to calculate damage during shakedown resulting from redistribution and relaxation due to plasticity and creep, which can be critical for accurately predicting remaining useful life and optimizing engine management.

1438 Thermal stress estimation method for structural integrity by Design of Experiment considering the dispersion

2005 ◽  
Vol 2005.1 (0) ◽  
pp. 295-296
Author(s):  
Masakazu Jimbo ◽  
Naoto Kasahara ◽  
Hiroshi Shibamoto ◽  
Kazuhiko Inoue
Keyword(s):  
Thermal Stress ◽  
Design Of Experiment ◽  
Structural Integrity ◽  
Estimation Method ◽  
Stress Estimation

scholarly journals Stress Estimation Method in a Concrete Member.

1998 ◽  
pp. 11-18
Author(s):  
Yoshitake Higuchi ◽  
Tohru Kanda ◽  
Chitoshi Miki
Keyword(s):  
Estimation Method ◽  
Concrete Member ◽  
Stress Estimation

Node-Based Soft Object Deformation Using Stress Estimation Method

2021 ◽  
pp. 169-182
Author(s):  
Mohd Nadzeri Omar ◽  
Yongmin Zhong
Keyword(s):  
Estimation Method ◽  
Stress Estimation ◽  
Soft Object

scholarly journals Uniaxial Static Stress Estimation for Concrete Structures Using Digital Image Correlation

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 319 ◽  
Author(s):  
Junhwa Lee ◽  
Eun Kim ◽  
Seongwoo Gwon ◽  
Soojin Cho ◽  
Sung-Han Sim
Keyword(s):  
Stress Relaxation ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Displacement Field ◽  
Concrete Structures ◽  
Estimation Method ◽  
Static Stress ◽  
Image Correlation ◽  
Accurate Estimation ◽  
Stress Estimation

This paper proposes a static stress estimation method for concrete structures, using the stress relaxation method (SRM) in conjunction with digital image correlation (DIC). The proposed method initially requires a small hole to be drilled in the concrete surface to induce stress relaxation around the hole and, consequently, a displacement field. DIC measures this displacement field by comparing digital images taken before and after the hole-drilling. The stress level in the concrete structure is then determined by solving an optimization problem, designed to minimize the difference between the displacement fields from DIC and the one from a numerical model. Compared to the pointwise measurements by strain gauges, the full-field displacement obtained by DIC provides a larger amount of data, leading to a more accurate estimation. Our theoretical results were experimentally validated using concrete specimens, demonstrating the efficacy of the proposed method.

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