Physicomechanical properties and creep behavior of plywood composed of fully and partially heat-treated veneers

2021 ◽  
Author(s):  
Fang-Yu Hsu ◽  
Ke-Chang Hung ◽  
Jin-Wei Xu ◽  
Tung-Lin Wu ◽  
Jyh-Horng Wu
Keyword(s):  
Creep Behavior ◽  
Physicomechanical Properties ◽  
Heat Treated

scholarly journals Temperature-Dependent Creep Behavior and Quasi-Static Mechanical Properties of Heat-Treated Wood

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 968
Author(s):  
Dong Xing ◽  
Xinzhou Wang ◽  
Siqun Wang
Keyword(s):  
Mechanical Properties ◽  
Creep Behavior ◽  
Cell Walls ◽  
Treated Wood ◽  
Crosslinking Reaction ◽  
Depth Sensing ◽  
Temperature Dependent ◽  
Heat Treated ◽  
Static Mechanical ◽  
Static Mechanical Properties

In this paper, Berkovich depth-sensing indentation has been used to study the effects of the temperature-dependent quasi-static mechanical properties and creep deformation of heat-treated wood at temperatures from 20 °C to 180 °C. The characteristics of the load–depth curve, creep strain rate, creep compliance, and creep stress exponent of heat-treated wood are evaluated. The results showed that high temperature heat treatment improved the hardness of wood cell walls and reduced the creep rate of wood cell walls. This is mainly due to the improvement of the crystallinity of the cellulose, and the recondensation and crosslinking reaction of the lignocellulose structure. The Burgers model is well fitted to study the creep behavior of heat-treated wood cell walls under different temperatures.

scholarly journals Water Resistance and Creep Behavior of Heat-Treated Moso Bamboo Determined by the Stepped Isostress Method

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1264
Author(s):  
Teng-Chun Yang ◽  
Tung-Lin Wu ◽  
Chin-Hao Yeh
Keyword(s):  
Heat Treatment ◽  
Water Absorption ◽  
Creep Behavior ◽  
Heat Treatment Temperature ◽  
Water Resistance ◽  
Absorption Efficiency ◽  
Treatment Temperature ◽  
Moso Bamboo ◽  
Phyllostachys Pubescens ◽  
Heat Treated

The influence of heat treatment on the physico-mechanical properties, water resistance, and creep behavior of moso bamboo (Phyllostachys pubescens) was determined in this study. The results revealed that the density, moisture content, and flexural properties showed negative relationships with the heat treatment temperature, while an improvement in the dimensional stability (anti-swelling efficiency and anti-water absorption efficiency) of heat-treated samples was observed during water absorption tests. Additionally, the creep master curves of the untreated and heat-treated samples were successfully constructed using the stepped isostress method (SSM) at a series of elevated stresses. Furthermore, the SSM-predicted creep compliance curves fit well with the 90-day full-scale experimental data. When the heat treatment temperature increased to 180 °C, the degradation ratio of the creep resistance (rd) significantly increased over all periods. However, the rd of the tested bamboo decreased as the heat treatment temperature increased up to 220 °C.

Creep behavior of heat treated beech wood and the relation to its chemical structure

2019 ◽  
Vol 226 ◽  
pp. 220-226 ◽  
Author(s):  
Fahimeh Hoseinzadeh ◽  
Seyed Majid Zabihzadeh ◽  
Foroogh Dastoorian
Keyword(s):  
Creep Behavior ◽  
Chemical Structure ◽  
Beech Wood ◽  
Heat Treated

Structural Integrity of a Standpipe Component in a Petrochemical Catalytic Cracking Unit: Part 1—Assessment of Creep Rupture Properties

2000 ◽  
Vol 122 (3) ◽  
pp. 264-268
Author(s):  
Levi de O. Bueno ◽  
Luiz Marino ◽  
Flavio A. S. Serra ◽  
Fernando T. Gazini
Keyword(s):  
Thermal Treatment ◽  
Grain Boundaries ◽  
Creep Behavior ◽  
Catalytic Cracking ◽  
Structural Integrity ◽  
Carbide Precipitation ◽  
Remaining Life ◽  
Heat Treated ◽  
Rupture Properties ◽  
Relevant Section

During a shutdown for general maintenance of a catalytic cracking unit, intergranular cracks were observed to occur during welding of the regenerator’s standpipe component manufactured from 2 1/4 Cr-1Mo steel. The cracking was observed to be related to intensive carbide precipitation in grain boundaries. To overcome the problem it was decided to heat-treat the relevant section of the component to dissolve these carbides and make possible its welding to a new virgin section of the tube. Samples of the material in its various conditions (virgin, ex-service, heat-treated and welded) were taken to check the efficiency of the thermal treatment in reducing the embrittlement effects and to carry out a general assessment of the remaining life of the component related to creep behavior considering smooth bar creep specimens. [S0094-4289(00)00403-5]

scholarly journals The effect of thermo-mechanical treatment of moso bamboo (Phyllostachys Pubescens) on its sorption and physicomechanical properties

2019 ◽  
Vol 70 (3) ◽  
pp. 265-272 ◽  
Author(s):  
Przemysław Mania ◽  
Jerzy Majka ◽  
Magdalena Zborowska
Keyword(s):  
Brinell Hardness ◽  
Sorption Isotherms ◽  
Physicomechanical Properties ◽  
Phyllostachys Pubescens ◽  
Oak Wood ◽  
Heat Treated ◽  
Anisotropy Index ◽  
The Mean ◽  
Gab Model ◽  
Common Oak

The aim of this study was to examine some properties of heat-treated (200 °C) and densified (treated) bamboo. Density (ρ), equilibrium moisture content (EMC), sorption hysteresis (H), swelling (S), and Brinell hardness (HB) were examined and compared with untreated bamboo (Phyllostachys sp.) and common oak (Quercus robur L.). The density of heat-treated bamboo (ρ = 1170 kg/m3) was higher than that of untreated bamboo (ρ = 850 kg/m3) and oak wood (ρ = 670 kg/m3). The sorption isotherms were parameterized with the Guggenheim-Anderson-deBoer (GAB) model. Treated bamboo showed lower EMC than untreated bamboo and oak wood in the entire hygroscopic range. The swelling anisotropy index of treated bamboo was the lowest (1.09). The mean HB of treated bamboo (HB=132 MPa) was significantly higher than that of oak and untreated bamboo.

Creep Behavior of a Single Crystal Nickel-Based Superalloy Containing Re/Ru at 1100°C/137MPa

2015 ◽  
Vol 816 ◽  
pp. 551-556
Author(s):  
Su Gui Tian ◽  
Bao Shuai Wang ◽  
Xin Ding ◽  
De Long Shu ◽  
Jing Wu
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Creep Resistance ◽  
Nickel Base Superalloy ◽  
Nickel Based Superalloy ◽  
Deformation Feature ◽  
Heat Treated ◽  
Initiation And Propagation ◽  
Nickel Base ◽  
Base Superalloy

Creep behavior of a heat treated single crystal nickel base superalloy containing Re/Ru under the test condition of 1100°C/137MPa high temperatures was investigated. The experimental results showed that the segregation extent of elements in the dendrite and inter-dendrite regions of single crystal superalloy decreases by heat treatment at high temperature. The creep life of the alloy at 1100°C/137MPa was measured to be 321 h displaying a better creep resistance. Wherein, significant amount of fine cubiodal γ′ particles precipitated in the γ matrix channels are considered to be the main reason of the alloy having the better creep resistance. The deformation feature of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. But in the latter stage of creep, the deformation feature of the alloy is dislocations shearing into the rafted γ′ phase. As creep goes on, the main / secondary slipping dislocations in the alloy are alternately activated to result in the initiation and propagation of the cracks along the interface of the rafted γ′/γ phase up to fracture, which is thought to be the fracture mechanism of the alloy during creep.

scholarly journals Creep Behavior of Ferritic Steels after Heat-treated

2015 ◽  
Vol 8 ◽  
pp. 1014-1022 ◽  
Author(s):  
González Gabriel ◽  
Molina Rene ◽  
Fernandez Pirrone Valentina ◽  
Gualdieri Gaston ◽  
Moro Lilian
Keyword(s):  
Creep Behavior ◽  
Ferritic Steels ◽  
Heat Treated

Structural Integrity of a Standpipe Component in a Petrochemical Catalytic Cracking Unit: Part 2—Assessment of Embrittlement Effects

2000 ◽  
Vol 122 (3) ◽  
pp. 269-272
Author(s):  
Levi de O. Bueno ◽  
Luiz Marino ◽  
Flavio A. S. Serra ◽  
Fernando T. Gazini
Keyword(s):  
Thermal Treatment ◽  
Grain Boundaries ◽  
Creep Behavior ◽  
Catalytic Cracking ◽  
Structural Integrity ◽  
Carbide Precipitation ◽  
Remaining Life ◽  
Heat Treat ◽  
Heat Treated ◽  
Relevant Section

During a shutdown for general maintenance of a catalytic cracking unit, intergranular cracks were observed to occur during welding of the regenerator’s standpipe component manufactured from 2 1/4 Cr-1Mo steel. The cracking was observed to be related to intensive carbide precipitation in grain boundaries. To overcome the problem it was decided to heat-treat the relevant section of the component to dissolve these carbides and make possible its welding to a new virgin section of the tube. Samples of the material in its various conditions (virgin, ex-service, heat-treated, and welded) were taken to check the efficiency of the thermal treatment in reducing the embattlement effects and to carry out a general assessment of the remaining life of the component related to creep behavior considering notched bar creep specimens. [S0094-4289(00)00503-X]

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