Hygro-thermal bending behavior of porous FG nano-beams via local/nonlocal strain and stress gradient theories of elasticity

2021 ◽  
Vol 263 ◽  
pp. 113627
Author(s):  
Rosa Penna ◽  
Luciano Feo ◽  
Giuseppe Lovisi
Keyword(s):  
Stress Gradient ◽  
Thermal Bending ◽  
Bending Behavior ◽  
Gradient Theories

Shakedown at Thermal Discontinuities Involving Thermal Membrane and Thermal Bending Stress

2012 ◽  
Author(s):  
Ali Asadkarami ◽  
Wolf Reinhardt
Keyword(s):  
Thermal Stress ◽  
Stress Gradient ◽  
Axial Direction ◽  
Bending Stress ◽  
Primary Stress ◽  
Perfectly Plastic ◽  
Thermal Bending ◽  
Asme Code ◽  
Elastic Perfectly Plastic ◽  
Shakedown Limit

The current ASME Code Section III NB-3200 rules on thermal stress ratchet require that the thermal stress must be less than the ratchet condition that Bree established for a cyclic pure thermal bending stress as a function of the level of primary membrane stress. It has been shown that this method can predict shakedown when elastic-perfectly plastic analysis shows ratcheting. However, there is also conservatism in the Code rules because the highest stresses that dominate the evaluation of a component are typically found at discontinuities, where there is a stress gradient at least in the axial direction. The stress limits, on the other hand, are based on stress distributions that are constant in the axial (and circumferential) direction. This paper investigates the effect of thermal discontinuities on the shakedown limit in the presence of a thermal through-wall gradient and a pressure-induced primary stress. The investigation is based on the simple model of a cylinder with an isolated thermal discontinuity. The effect of proximity to another discontinuity is explored, to obtain the minimum distance between two discontinuities that would allow them to be considered separately. Simple rules are developed and proposed to take potentially advantage of higher stress limits at an isolated discontinuity.

Structure-Based Huge Hard-Spring Torsional Resonator Coupled with Thermal Bending for Infrared Sensor

2020 ◽  
Vol 140 (9) ◽  
pp. 240-245
Author(s):  
Masaki Okamoto ◽  
Tomoya Hatagaki ◽  
Shinya Kumagai ◽  
Minoru Sasaki
Keyword(s):  
Infrared Sensor ◽  
Thermal Bending

The microstructure and three-point bending behavior of Ni–Co/WC composite cladding coating

2019 ◽  
Vol 110 (4) ◽  
pp. 297-306
Author(s):  
Guirong Yang ◽  
Wenming Song ◽  
Jian Li ◽  
Fuqiang Wang ◽  
Ying Ma ◽  
...  
Keyword(s):  
Three Point Bending ◽  
Bending Behavior

Thermal bending and vibration of FGM plates with various cutouts and complex shapes using isogeometric method

2020 ◽  
pp. 113518
Author(s):  
Saifeng Zhong ◽  
Jianhua Zhang ◽  
Guoyong Jin ◽  
Tiangui Ye ◽  
Xiaoji Song
Keyword(s):  
Complex Shapes ◽  
Thermal Bending
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