Experimental Investigation of Water-Retaining and Mechanical Behaviors of Unbound Granular Materials under Infiltration

Li, Ning; Tian, Ye; Ma, Biao; D, Hu

doi:10.3390/su14031174

Cited by 4 publications

(9 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fatigue life analysis in this study uses strain life as a control. Mechanical changes in the material are indicated by a decrease in the modulus of the material under plastic strain [34]. Several parameters affect the fatigue life: the applied load, surface area, and fatigue [35].…”

Section: Discussionmentioning

confidence: 99%

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

et al. 2023

View full text Add to dashboard Cite

In the present study, the effects of human physiological activity levels on the fatigue life of a porous magnesium scaffold have been investigated. First, the dynamic immersion and biomechanical testing are carried out on a porous magnesium scaffold to simulate the physiological conditions. Then, a numerical data analysis and computer simulations predict the implant failure values. A 3D CAD bone scaffold model was used to predict the implant fatigue, based on the micro-tomographic images. This study uses a simulation of solid mechanics and fatigue, based on daily physiological activities, which include walking, running, and climbing stairs, with strains reaching 1000–3500 µm/mm. The porous magnesium scaffold with a porosity of 41% was put through immersion tests for 24, 48, and 72 h in a typical simulated body fluid. Longer immersion times resulted in increased fatigue, with cycles of failure (Nf) observed to decrease from 4.508 × 1022 to 2.286 × 1011 (1.9 × 1011 fold decrease) after 72 hours of immersion with a loading rate of 1000 µm/mm. Activities played an essential role in the rate of implant fatigue, such as demonstrated by the 1.1 × 105 fold increase in the Nf of walking versus stair climbing at 7.603 × 1011 versus 6.858 × 105, respectively. The dynamic immersion tests could establish data on activity levels when an implant fails over time. This information could provide a basis for more robust future implant designs.

show abstract

Section: Discussionmentioning

confidence: 99%

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Then, there are three working conditions for UGM in permeable pavement: repeated load only, repeated load after infiltration, and simultaneous action with load and infiltration, respectively. Taking the working conditions into account, Li et al conducted experimental tests to investigate the effect on the water-retention, particle migration and bearing capacity of UGM considering the influence of infiltration [26]. However, plastic strain was not fully analyzed and compared.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the main influence factor of this study, the used gradation of UGM was the median with 96% compactness at optimum moisture content. The improved PUMA test method was used for the investigation, which we referenced from a previous study in the literature [26]. In this study, the plastic strain and plastic strain rate were the main analysis indicators, the relationship between plastic strain and plastic strain rate, and the elastoplastic total strains, were also analyzed.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Characteristics and Calculation Models of Unbound Granular Materials under Repeated Load and Water Infiltration

Li,

Zhou,

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

Unbound granular materials (UGMs) have advantages in their water storage and drainage capabilities in permeable pavement, which is a benefit for urban sustainable development. The plastic strain of UGM is a crucial mechanical property that affects its design and construction. During its service life, repeated load only, repeated load after infiltration, and simultaneous action with load and infiltration are the three inevitable working conditions that will impact plastic strain, especially dynamic water infiltration. How these working conditions influence plastic strain needs to be focused on and solved. This study conducted laboratory tests to investigate plastic strain considering factors such as loading strength and repetitions, as well as infiltration number and duration. The results showed that the plastic strain and plastic strain rate exhibited similar variations during the repeated load only test and repeated load after infiltration test. The plastic strain changed significantly with different infiltration numbers but had relatively small variations in terms of the plastic strain rate. Longer infiltration duration led to greater plastic strain. With the simultaneous action, the plastic strain presented different variation to the other two conditions. The first and second infiltrations had a more obvious influence on the plastic strain when infiltration was applied. Calculation models were established to predict the effects of loading strength and repetitions as well as infiltration number and duration on plastic strains. For the repeated load only test, an error of 4.6% was observed. In terms of the infiltration number and duration, the errors were found to be 18.5% and 8.5%, respectively. The power function and Sigmoidal Logistic model were used to establish calculation models under the simultaneous action test with a maximum error of 11.5% ranging from 100 to 60,000 repetitions. The proposed calculation models can characterize plastic strain under the three working conditions very well, which can help in the design and construction of fully permeable pavement.

show abstract

“…Stolle et al observed that the nature of fine content also influences the moisture sensitivity of the resilient modulus of aggregate [18]. Recent studies revealed that infiltration and gradation have significant effects on the bearing capacity, water retention, and mechanical behaviors of unbound granular material [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

et al. 2022

View full text Add to dashboard Cite

In this study, a comprehensive laboratory testing program was designed to study the resilience characteristics of unbound granular materials (aggregate base coarse) using the repeated load triaxial test (RLTT). During the experimental program, the resilient modulus of unbound granular material was examined using different moisture content levels, material gradation using Fuller’s equation, and stress levels. The results show that the moisture content, material gradation, and stress level have a major influence on the resilient modulus of unbound granular materials. Furthermore, a linear model has been developed between moisture content and the resilient modulus. The model significantly predicts the change in resilient modulus by changing moisture content. The study also aimed to improve the modified Uzan model by adding the effect of moisture content. An improved modified Uzan stress moisture model has been developed, which shows a strong relationship between the resilient modulus, stress, and moisture content. This study can be used as a benchmark for validating other numerical data.

show abstract

Experimental Investigation of Water-Retaining and Mechanical Behaviors of Unbound Granular Materials under Infiltration

Cited by 4 publications

References 35 publications

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

Level of Activity Changes Increases the Fatigue Life of the Porous Magnesium Scaffold, as Observed in Dynamic Immersion Tests, over Time

Plastic Deformation Characteristics and Calculation Models of Unbound Granular Materials under Repeated Load and Water Infiltration

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

Contact Info

Product

Resources

About