scholarly journals Applications of Boundary Effect Model to Quasi-Brittle Fracture of Concrete and Rock

2005 ◽  
Vol 3 (3) ◽  
pp. 413-422 ◽  
Author(s):  
Kai Duan ◽  
Xiaozhi Hu
Keyword(s):  
Brittle Fracture ◽  
Boundary Effect ◽  
Effect Model

Quasi-brittle fracture criterion of bamboo-based fiber composites in transverse direction based on boundary effect model

2019 ◽  
Vol 220 ◽  
pp. 347-354 ◽  
Author(s):  
Wen Liu ◽  
Ying Yu ◽  
Xiaozhi Hu ◽  
Xiangyu Han ◽  
Peng Xie
Keyword(s):  
Brittle Fracture ◽  
Transverse Direction ◽  
Fracture Criterion ◽  
Boundary Effect ◽  
Fiber Composites ◽  
Effect Model ◽  
Brittle Fracture Criterion

Problems with Hu-Duan Boundary Effect Model and Its Comparison to Size-Shape Effect Law for Quasi-Brittle Fracture

2010 ◽  
Vol 136 (1) ◽  
pp. 40-50 ◽  
Author(s):  
Qiang Yu ◽  
Jia-Liang Le ◽  
Christian G. Hoover ◽  
Zdeněk P. Bažant
Keyword(s):  
Brittle Fracture ◽  
Boundary Effect ◽  
Shape Effect ◽  
Effect Model

Size effect research of tensile strength of bamboo scrimber based on boundary effect model

2020 ◽  
Vol 239 ◽  
pp. 107319
Author(s):  
Peng Xie ◽  
Wen Liu ◽  
Yucun Hu ◽  
Xinmiao Meng ◽  
Jiankun Huang
Keyword(s):  
Tensile Strength ◽  
Size Effect ◽  
Boundary Effect ◽  
Effect Model ◽  
Bamboo Scrimber

scholarly journals Critical comparison of the boundary effect model with cohesive crack model and size effect law

2019 ◽  
Vol 215 ◽  
pp. 193-210 ◽  
Author(s):  
Christian Carloni ◽  
Gianluca Cusatis ◽  
Marco Salviato ◽  
Jia-Liang Le ◽  
Christian G. Hoover ◽  
...  
Keyword(s):  
Size Effect ◽  
Boundary Effect ◽  
Cohesive Crack ◽  
Crack Model ◽  
Cohesive Crack Model ◽  
Critical Comparison ◽  
Effect Model

Foreign Trade in Russia

2014 ◽  
Vol 3 (3) ◽  
pp. 1-18 ◽  
Author(s):  
Vasily Erokhin
Keyword(s):  
Economic Development ◽  
Foreign Trade ◽  
Trade Liberalization ◽  
Boundary Effect ◽  
Import Substitution ◽  
Economic Security ◽  
Structural Problems ◽  
Export Expansion ◽  
Effect Model ◽  
Level Of Economic Development

Until recently only one of the largest economies – Russia was not among the WTO members. Russia's accession into the WTO drew out hidden structural problems of national economy, low competitiveness of domestic producers, dependence on fossil-fuel exports, and regional disparities. The paper aims at overview of the existing distortions of Russia's foreign trade and their potential threats to sustainable economic development and national economic security in view of the running trade liberalization. Regional implementations of trade liberalization are investigated on the case of the Stavropol Krai, one of the southern regions of Russia with an average level of economic development. The Gravity model is implemented to analyze trade activities of the region; the Boundary Effect Model is utilized to evaluate the effects of trade liberalization on separate industries. Simulation allowed distributing regional commodities on their competitiveness depending on export quota and boundary effect, and accessing aftermaths of export expansion and import substitution.

Influence of specimen geometry on fracture toughnesses of concrete based on boundary effect model

2021 ◽  
pp. 103135
Author(s):  
Yanhua Zhao ◽  
Nana Yin ◽  
Bohan Xu ◽  
Ye Tao
Keyword(s):  
Boundary Effect ◽  
Specimen Geometry ◽  
Effect Model

scholarly journals Determination of Fracture Properties of Concrete Using Size and Boundary Effect Models

2019 ◽  
Vol 9 (7) ◽  
pp. 1337 ◽  
Author(s):  
Xiaofeng Gao ◽  
Chunfeng Liu ◽  
Yaosheng Tan ◽  
Ning Yang ◽  
Yu Qiao ◽  
...  
Keyword(s):  
Crack Length ◽  
Boundary Effect ◽  
Test Results ◽  
Fracture Test ◽  
Concrete Material ◽  
Material Parameters ◽  
Fracture Parameters ◽  
Effect Model ◽  
Different Types

Tensile strength and fracture toughness are two essential material parameters for the study of concrete fracture. The experimental procedures to measure these two fracture parameters might be complicated due to their dependence on the specimen size or test method. Alternatively, based on the fracture test results only, size and boundary effect models can determine both parameters simultaneously. In this study, different versions of boundary effect models developed by Hu et al. were summarized, and a modified Hu-Guan’s boundary effect model with a more appropriate equivalent crack length definition is proposed. The proposed model can correctly combine the contributions of material strength and linear elastic fracture mechanics on the failure of concrete material with any maximum aggregate size. Another size and boundary model developed based on the local energy concept is also introduced, and its capability to predict the fracture parameters from the fracture test results of wedge-splitting and compact tension specimens is first validated. In addition, the classical Bažant’s Type 2 size effect law is transformed to its boundary effect shape with the same equivalent crack length as Koval-Gao’s size and boundary effect model. This improvement could extend the applicability of the model to infer the material parameters from the test results of different types of specimens, including the geometrically similar specimens with constant crack-length-to-height ratios and specimens with different initial crack-length-to-height ratios. The test results of different types of specimens are adopted to verify the applicability of different size and boundary effect models for the determination of fracture toughness and tensile strength of concrete material. The quality of the extrapolated fracture parameters of the different models are compared and discussed in detail, and the corresponding recommendations for predicting the fracture parameters for dam concrete are proposed.

Sign in / Sign up

Export Citation Format

Share Document