INVESTIGATION OF THE ENERGY ABSORPTION CHARACTERISTICS OF NEW POLYMERIC MATERIALS

AbstractIn this paper, polyvinyl chloride (PVC) coarse aggregate with different mixing contents is used to solve the problems of plastic pollution, low energy absorption capacity and poor damage integrity, which provides an important reference for PVC plastic concrete used in the initial support structures of highway tunnels and coal mine roadway. At the same time, the energy absorption characteristics and their relationship under different impact loads are studied, which provides an important reference for predicting the energy absorption characteristics of concrete under other PVC aggregate content or higher impact speed. This study replaced natural coarse aggregate in concrete with different contents and equal volume of well-graded flaky PVC particles obtained by crushing PVC soft board. Also, slump, compression, and splitting strength tests, a free falling low-speed impact test of steel balls and a high-speed impact compression test of split Hopkinson pressure bar (SHPB) were carried out. Results demonstrate that the static and dynamic compressive strength decreases substantially, and the elastic modulus and slump decrease slowly with the increase of the mixing amount of PVC aggregate (0–30%). However, the energy absorption rate under low-speed impact and the specific energy absorption per MPa under high-speed impact increase obviously, indicating that the energy absorption capacity is significantly enhanced. Regardless of the mixing amount of PVC aggregate, greater strain rate can significantly enhance the dynamic compressive strength and the specific energy absorption per MPa. After the uniaxial compression test or the SHPB impact test, the relative integrity of the specimen is positively correlated with the mixing amount of PVC aggregate. In addition, the specimens are seriously damaged with the increase of the impact strain rate. When the PVC aggregate content is 20%, the compressive strength and splitting strength of concrete are 33.8 MPa and 3.26 MPa, respectively, the slump is 165 mm, the energy absorption rate under low-speed impact is 89.5%, the dynamic compressive strength under 0.65 Mpa impact air pressure is 58.77 mpa, and the specific energy absorption value per MPa is 13.33, which meets the requirements of shotcrete used in tunnel, roadway support and other impact loads. There is a linear relationship between the energy absorption characteristics under low-speed impact and high-speed impact. The greater the impact pressure, the larger the slope of the fitting straight line. The slope and intercept of the fitting line also show a good linear relationship with the increase of impact pressure. The conclusions can be used to predict the energy absorption characteristics under different PVC aggregate content or higher-speed impact pressure, which can provide important reference for safer, more economical, and environmental protection engineering structure design.

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Energy absorption characteristics of origami-inspired honeycomb sandwich structures under low-velocity impact loading

Materials & Design ◽

10.1016/j.matdes.2021.109837 ◽

2021 ◽

pp. 109837

Author(s):

Jiaqi Qi ◽

Cheng Li ◽

Ying Tie ◽

Yanping Zheng ◽

Yuechen Duan

Keyword(s):

Energy Absorption ◽

Impact Loading ◽

Sandwich Structures ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Honeycomb Sandwich ◽

Absorption Characteristics

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Attempts to improve energy absorption characteristics of circular metal tubes subjected to axial loading

Thin-Walled Structures ◽

10.1016/j.tws.2010.01.012 ◽

2010 ◽

Vol 48 (6) ◽

pp. 379-390 ◽

Cited By ~ 100

Author(s):

S. Salehghaffari ◽

M. Tajdari ◽

M. Panahi ◽

F. Mokhtarnezhad

Keyword(s):

Energy Absorption ◽

Axial Loading ◽

Absorption Characteristics

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I-1 Wave energy absorption characteristics of circular air chamber for use of light beacon

Ocean Engineering ◽

10.1016/0029-8018(85)90033-2 ◽

1985 ◽

Vol 12 (6) ◽

pp. 554-555 ◽

Cited By ~ 1

Author(s):

Reisaku Inoue ◽

Masami Iwai ◽

Masaru Yahagi ◽

Tetsuo Yamazaki

Keyword(s):

Energy Absorption ◽

Wave Energy ◽

Air Chamber ◽

Absorption Characteristics

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Energy absorption characteristics of square frustum lattice structure

Composite Structures ◽

10.1016/j.compstruct.2021.114492 ◽

2021 ◽

pp. 114492

Author(s):

Shuguang Yao ◽

Yili Zhou ◽

Zhixiang Li ◽

Peng Zhang ◽

Yuehao Cao ◽

...

Keyword(s):

Energy Absorption ◽

Lattice Structure ◽

Absorption Characteristics

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Investigation on Energy Absorption Characteristics of PVB Laminated Windshield Subject to Human Head Impact

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.956 ◽

2010 ◽

Vol 34-35 ◽

pp. 956-960 ◽

Cited By ~ 5

Author(s):

Bo Han Liu ◽

Meng Yi Zhu ◽

Yue Ting Sun ◽

Jun Xu ◽

Dong Yun Ge ◽

...

Keyword(s):

Dynamic Behavior ◽

Energy Absorption ◽

Human Head ◽

Head Impact ◽

Laminated Glass ◽

Absorption Property ◽

Element Simulation ◽

Impact Position ◽

Two Parameters ◽

Absorption Characteristics

In this paper, energy absorption characteristics of PVB laminated windshield subject to human head impact are studied. SHPB method is carried out to obtain the constitutive relationships of PVB laminated glass in dynamic behavior. With the SHPB results embedded, finite element simulation is used to study the dynamic behavior of PVB laminated windshield. In particular, energy absorption characteristics are investigated. Two parameters for measuring the energy absorption property of windshield are suggested, i.e. loss of head velocity and HIC value and a parametric study is carried out to see the effect of impact velocity and impact position. Results can shed lights on the research of energy absorption capability of PVB laminated windshield.

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Correlation between Zirconium Addition and Compressive Properties of AZ31 Mg Alloy Foams

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.75 ◽

2011 ◽

Vol 121-126 ◽

pp. 75-79

Author(s):

Bo Young Hur ◽

Rui Zhao

Keyword(s):

Mechanical Properties ◽

Energy Absorption ◽

Mg Alloy ◽

Compressive Properties ◽

Absorption Properties ◽

Compression Behavior ◽

Foaming Agent ◽

Az31 Mg Alloy ◽

Absorption Characteristics ◽

Zirconium Addition

The compressive behaviors of AZ31-Zr foams using Ca particles as thickening agent and CaCO3 powder as foaming agent were investigated in this study. The porosity was about 48.7%~72.9%, pore size was between 0.43~0.97 mm, and homogenous pore structures were obtained. Mechanical properties of AZ31 Mg alloy foams were investigated by means of UTM. The cellular AZ31 Mg foams possess superior comprehensive mechanical properties. The energy absorption characteristics and the effects of compression behavior on the energy absorption properties for the cellular AZ31 Mg foams have been investigated and discussed. The results show that with the addition of Zr, the Mg alloy foam has the highest energy absorption value of 16.26 MJ/m3 and the hardness value of 81.8 HV, which is much higher than that of the foams fabricated without Zr.

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