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Article | 28-August-2018

VALIDATION OF THE FIB 2010 AND RILEM B4 MODELS FOR PREDICTING CREEP IN CONCRETE

Creep strain, a requirement of the concrete design process, is a complex phenomenon that has proven difficult to model. Although laboratory tests may be undertaken to determine the creep, these are generally expensive and not a practical option. Hence, empirical code-type prediction models are used to predict creep strain. This paper considers the accuracy of both the relatively new international fibModel Code 2010 and RILEMModel B4, when compared with the actual strains measured on a range of

George C. FANOURAKIS

Architecture, Civil Engineering, Environment, Volume 10 , ISSUE 3, 95–101

Article | 01-April-2018

The Effect of Residual Stress on Coupling Power Loss of VCSEL Modulus

in reflow process and the creep deformation in the acceleration aging were simulated and analyze. The time and temperature dependent material properties of solders are employed. Numerical results indicate that the post-weld-shift introduced from residual stress in the solidification process are significant, and are also the key reasons to reduce the coupling efficiency inVCSELpackaging.The non-sequential components models in commercial Zemaxoptical package were used to estimate the optical

Jao-Hwa Kuang, Chao-Ming Hsu, Ah-Der Lin, Jyun-Wei Luo

International Journal of Advanced Network, Monitoring and Controls, Volume 1 , ISSUE 1, –

Article | 15-August-2021

Chemical and mechanical characteristics of contemporary thermoplastic orthodontic materials

, were subjected to instrumented indentation testing (IIT) employing a Vickers indenter. Martens Hardness (HM), Indentation Modulus (EIT), Elastic to Total Work Ratio (elastic index (ηIT)) and Indentation Creep (CIT) were determined according to ISO 14577-1. The mean values of the mechanical properties were statistically analysed by one way ANOVA and Tukey Kramer multiple comparison test at a = 0.05. Results: ATR-FTIR analysis identified that Invisalign was a polyurethane-based material, whereas

Alexandros Alexandropoulos, Youssef S. Al Jabbari, Spiros Zinelis, Theodore Eliades

Australasian Orthodontic Journal, Volume 31 , ISSUE 2, 165–170

research-article | 30-November-2018

EVALUATION OF TIME DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE MEMBER WITH TOP AND BOTTOM TENDONS

1. INTRODUCTION Prestress losses in a pretensioned concrete member are divided into two groups: immediate and time dependent. The immediate losses include losses due to elastic shortening of concrete, short term relaxation of prestressing tendons, increasing the temperature while curing concrete, friction at the deflecting devices, and seating of strand in the anchorage device. The time dependent losses are losses due to relaxation of prestressing steel, creep and shrinkage of concrete

Vadzim PARKHATS, Rafał KRZYWOŃ

Architecture, Civil Engineering, Environment, Volume 12 , ISSUE 3, 105–112

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