Creep and damage of an adhesive anchor system by accelerated testing and modeling

2017 ◽  
Vol 26 (2) ◽  
pp. 251-273 ◽  
Author(s):  
Lingqi Yang ◽  
Fangliang Chen ◽  
Huiming Yin
Keyword(s):  
Superposition Principle ◽  
Test Method ◽  
Accelerated Testing ◽  
Small Scale ◽  
Test Protocol ◽  
Anchor System ◽  
Anchor Systems ◽  
Long Term Performance ◽  
Term Performance

An accelerated testing and modeling method was proposed and implemented to predict the long-term performance through short-term pullout tests of a cylindrical anchor core by tensile loading at different elevated testing temperatures. Dimensional analysis was conducted to predict the creep behavior of adhesive anchor systems by small-scale tests. By using the frequency-temperature superposition principle, the master curves of the complex and storage moduli were generated in the Prony series form. By performing inverse numerical Laplace transformation, the creep compliance of the adhesive in the time domain was calculated and then used in the viscoelastic analysis of the adhesive anchor system. To validate the model, six adhesive anchor samples with different sizes of hole diameter and depth were fabricated and creep tests were then conducted at different temperatures. Overall, the test results agree well with the theoretical ones using the adhesive’s viscoelastic properties. An accelerated test protocol was further established for the long-term performance analysis of the adhesive anchor systems. The error sources of the experiments were discussed. Because of the generality of the formulation and testing mechanism, the present test method is applicable to the design and analysis of different types and sizes of adhesive anchor systems.

A Method for Measuring the Creep Behavior of Pressurized Polymer Tubing

2001 ◽  
Author(s):  
Chunhui Wu ◽  
Susan C. Mantell ◽  
Jane H. Davidson
Keyword(s):  
Heat Exchanger ◽  
Strain Gage ◽  
Hot Water ◽  
Test Method ◽  
Hoop Strain ◽  
Dog Bone ◽  
Thin Walled ◽  
Long Term Performance ◽  
Term Performance

Abstract Polymer components have been proposed for use in domestic solar hot water heating systems. A polymer heat exchanger is under development for such systems. For heat transfer considerations, the heat exchanger will be comprised of many thin walled tubes. The heat exchanger must survive 10 years of service at high pressure (1.55 MPa) and high temperature (82°C). A novel method has been developed for evaluating the long term performance (creep) of the polymer tubing. Traditional creep testing, performed with dog bone test specimens can not be applied because the thin walled tubing has anisotropic material properties. Consequently, performance must be evaluated directly on the extruded tubing. The method entails wrapping a Constantan wire around the tube specimen to continuously record the hoop strain. For pressure loading of tubing, this method offers significant improvements over strain gage instrumentation. In this paper, the test method is described, an analysis of the strain transfer between the tubing and wire wrap is presented, and strain data for polypropylene tubing measured with a strain gage and wire wrap are compared. The data show that the wire measurement method can be successfully used for the characterization of long term mechanical behavior of polymer tubes.

Long-Term Performance of Epoxy Adhesive Anchor Systems

2013 ◽  
Author(s):  
Ronald A. Cook ◽  
Elliot P. Douglas ◽  
Todd M. Davis ◽  
Changhua Liu ◽  
◽  
...  
Keyword(s):  
Epoxy Adhesive ◽  
Anchor Systems ◽  
Long Term Performance ◽  
Term Performance

Long-Term Performance Estimation of Aquaculture Solar Aeration System for Developing World

2017 ◽  
Author(s):  
Sami Yamani Douzi Sorkhabi ◽  
Ahmed Mahmoud ◽  
Shakya Sur ◽  
Elan Pavlov ◽  
Amy Bilton
Keyword(s):  
Solar Energy ◽  
Dissolved Oxygen ◽  
Developing World ◽  
Performance Estimation ◽  
Small Scale ◽  
Oxygen Level ◽  
Aeration System ◽  
Long Term Performance ◽  
Term Performance

Over the past several decades, the wild capture fisheries have become unsustainable and the practice of small-scale aquaculture has increased in the rural areas of developing countries. In aquaculture ponds, it is critical to maintain adequate levels of dissolved oxygen to ensure productivity and fish health. To provide adequate dissolved oxygen, aeration systems can be employed. However, the current aeration systems are expensive and require secure access to electricity, putting them out of reach for developing world applications. To address this need, a simple aeration system powered by solar energy, called a Solar Updraft Aerator (SUpA) is proposed. SUpA induces convection in the pond by directing absorbed solar energy to deeper pond layers, increasing the dissolved oxygen level. To be effective, SUpA needs to provide adequate dissolved oxygen even when there are multiple days of low sunlight. This research estimates the long-term performance of SUpA under different weather conditions and for a period of 15 to 18 years. Through this process, the dissolved oxygen level of the aquaculture pond is simulated with and without SUpA system to evaluate the magnitude of the influence. The results indicate that SUpA can significantly reduce the number of hours that the dissolved oxygen level is below the needed threshold.

scholarly journals NNWSI Waste Form Performance Test Development

1984 ◽  
Vol 44 ◽  
Author(s):  
John K. Bates ◽  
Thomas J. Gerding
Keyword(s):  
Performance Test ◽  
Test Development ◽  
Test Method ◽  
Waste Form ◽  
Analog Test ◽  
Waste Package ◽  
Long Term Performance ◽  
Term Performance

AbstractA test method has been developed to measure the release of radionuclides from the waste package under simulated NNWSI repository conditions, and to provide information concerning materials interactions that may occur in the repository. Data from 13 weeks of unsaturated testing are discussed and compared to that from a 13 week analog test. The data indicate that the waste form test is capable of producing consistent, reproducible results that will be useful in evaluating the role of the waste package in the long-term performance of the repository.

Evaluating the long-term performance of low-cost adsorbents using small-scale adsorption column experiments

2016 ◽  
Vol 101 ◽  
pp. 429-440 ◽  
Author(s):  
O. Callery ◽  
M.G. Healy ◽  
F. Rognard ◽  
L. Barthelemy ◽  
R.B. Brennan
Keyword(s):  
Low Cost ◽  
Small Scale ◽  
Column Experiments ◽  
Adsorption Column ◽  
Long Term Performance ◽  
Term Performance

Long-Term Performance Analysis of Geomembrane Considering Stress Cracking Resistance

2016 ◽  
Vol 879 ◽  
pp. 838-842
Author(s):  
Han Yong Jeon
Keyword(s):  
Quality Control ◽  
Test Method ◽  
Short Term ◽  
Cracking Behavior ◽  
Stress Cracking ◽  
Failure Times ◽  
Crack Behavior ◽  
Long Term Performance ◽  
Term Performance

In this study, key properties of polyethylene resin and HDPE GM were tested for comparing their stress crack behaviors. Stress cracking time was differed from each type of resins and products. The failure times of ESCR test were too long compared to SP-NCTL's. The SP-NCTL results of RWOA was failed earlier than RWA‘s, GM1’s and GM2’s. But there was no difference between each sample of the results of ESCR test within short term testing duration. The ESCR test was influenced by stress relaxation during the test. The SP-NCTL test is reasonable for verifying stress cracking behavior and construction quality control. According to this study, ESCR test is not appropriate for determining the stress crack behavior, but SP-NCTL test is better test method for predicting the stress crack behaviors of HDPE GM.

scholarly journals Evaluation of Long-Term Performance for Bonded Natural Stone Pavement Using Accelerated Pavement Test [Part Ⅱ: Skid Resistance, Response of Deflection and FEM Analysis]

2020 ◽  
Vol 10 (3) ◽  
pp. 879
Author(s):  
Junho Gong ◽  
Eui-Seok Han ◽  
Sun-Kyu Park ◽  
Dooyong Cho
Keyword(s):  
Fem Analysis ◽  
Test Method ◽  
Natural Stone ◽  
Small Element ◽  
Skid Resistance ◽  
Resistance Response ◽  
Pavement Testing ◽  
Long Term Performance ◽  
Term Performance

Natural stone-paved roads have been generally used to preserve historical regions due to its architectural aesthetic aspect and environmental impact. However, there are limitations of travelling speed and traffic volume owing to the defects caused by the increased traffic loading and volume. To deal with these hindrances, ultra-rapid-hardening cement for both jointing and laying course materials in rigid small element pavement was considered. The objective of the present study was to continuously evaluate and compare the long-term performance of the suggested bound stone pavement throughout the various test criteria such as skid resistance and Falling Weight Deflectometer tests. The skid resistance outcome was met to the requirement and the response of deflection was measured following by related test method. To compare rut depth, the Finite Element Method (FEM) analysis was performed by modelling with material properties and by creating the loading cycle for imitating the Accelerated Pavement Testing (APT). The maximum deflections of asphalt, concrete block, stone A and stone B were calculated to 17.7, 6.1, 6.3, and 3.6 mm, respectively. Compared to the final outcomes of APT and FEM analysis, there was a difference ranging from 2.1 to 2.3 mm in bound stone pavement B and A, respectively.

scholarly journals Development of Test Equipment for Evaluating Hydraulic Conductivity of Permeable Block Pavements

2018 ◽  
Vol 10 (7) ◽  
pp. 2549 ◽  
Author(s):  
Jaehun Ahn ◽  
Aryssa Marcaida ◽  
Yoongeun Lee ◽  
Jongwon Jung
Keyword(s):  
Low Impact Development ◽  
Test System ◽  
Silica Sand ◽  
Small Scale ◽  
Pavement Materials ◽  
Constant Head ◽  
Set Up ◽  
Long Term Performance ◽  
Term Performance

The use of permeable block pavement has been acknowledged as one of the promising Low Impact Development (LID) strategies to mitigate the harmful effects of depletion of natural surfaces, due to the uncontrollable development of infrastructure and buildings. Numerous studies, associated with drainage properties and long-term performance of this traditional pavement alternative, have been conducted in the past 30 years. Nevertheless, standardized equipment and methodologies are still limited, specifically for small-scale laboratory models. This paper suggests equipment that is capable of evaluating the hydraulic performance of permeable pavement materials in a laboratory set-up, by monitoring permeability and simulating the physical clogging process. Constant head permeability tests with systematic application of fine clogging particles were conducted on three identical permeable block systems (PBS), composed of four stone pavers. Each test system received an equivalent amount of eight years’ particle loading of silica sand, with different size distributions. The experimental results revealed that all the models showed permeability degradation trends similar to those presented in other literature.

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