Experimental Research on Dynamics Characteristics and Damage of ALC Wallboard

2012 ◽  
Vol 535-537 ◽  
pp. 1780-1784
Author(s):  
Yan Min Yang ◽  
Hao Zhang
Keyword(s):  
Structural Damage ◽  
Performance Test ◽  
Lightweight Concrete ◽  
Damping Ratio ◽  
Impact Resistance ◽  
Wall Material ◽  
Composite Sandwich ◽  
Building Wall ◽  
Resistance Performance ◽  
The Impact

The new building wall material ALC ( Autoclaved Lightweight Concrete) wallboard is solid composite sandwich panel. The existing standard requires that the ALC wallboard must meet resistance performance when it is laid into the wall. The evaluation index is determined and exists error. In order to guarantee the ALC board has better suitability，and make up the deficiency of the current specification. Through the impact resistance performance test of the ALC wallboard， study the dynamics characteristics under impact loading. Do some further analysis of the ALC wallboard dynamic characteristics damage problems through the change of frequency and the damping ratio. In turn， these changes can be the basis of structural damage evaluation. Laying a foundation for the ALC wallboard can better applied in practical projects.

Experimental Research on Mechanical Properties of ALC Wallboard

2011 ◽  
Vol 368-373 ◽  
pp. 423-427
Author(s):  
Yan Min Yang ◽  
Yi Ran Zhang
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Lightweight Concrete ◽  
Steel Wire ◽  
Impact Resistance ◽  
Wall Material ◽  
Composite Sandwich ◽  
Practical Engineering ◽  
Bending Capacity ◽  
Building Wall

The new building wall material solid composite sandwich panel consists of panel and inserted layer material-steel wire nets of composite light bar, and it is called ALC ( Autoclaved Lightweight Concrete) wallboard. The transportation, installation of ALC wallboard is required to meet certain strength requirement, and the wallboard can carry the aseismatic behavior and the bending capacity when it is laid into the wall. Therefore, in order to ensure the ALC wallboard can be better applied in practical engineering, the experimental research need to be done on the wallboard mechanical properties, such as impact resistance, hanging force, bending resistance, etc.

scholarly journals Evaluation of the Impact Resistance of Various Composite Sandwich Beams by Vibration Tests

2011 ◽  
Vol 18 (6) ◽  
pp. 789-805 ◽  
Author(s):  
Amir Shahdin ◽  
Joseph Morlier ◽  
Laurent Mezeix ◽  
Christophe Bouvet ◽  
Yves Gourinat
Keyword(s):  
Structural Integrity ◽  
Impact Damage ◽  
Glass Fibers ◽  
Damping Ratio ◽  
Impact Resistance ◽  
Experimental Tests ◽  
Sandwich Beams ◽  
Low Velocity ◽  
Composite Sandwich ◽  
The Impact

Impact resistance of different types of composite sandwich beams is evaluated by studying vibration response changes (natural frequency and damping ratio). This experimental works will help aerospace structural engineer in assess structural integrity using classification of impact resistance of various composite sandwich beams (entangled carbon and glass fibers, honeycomb and foam cores). Low velocity impacts are done below the barely visible impact damage (BVID) limit in order to detect damage by vibration testing that is hardly visible on the surface. Experimental tests are done using both burst random and sine dwell testing in order to have a better confidence level on the extracted modal parameters. Results show that the entangled sandwich beams have a better resistance against impact as compared to classical core materials.

Flexural and Creep Performances of Wood Fiber Reinforced Polymer Composite

2016 ◽  
Vol 850 ◽  
pp. 91-95
Author(s):  
Yan Cao ◽  
Wei Hong Wang ◽  
Hai Long Xu ◽  
Qing Wen Wang
Keyword(s):  
Wood Fiber ◽  
Impact Resistance ◽  
Fiber Reinforced Polymer ◽  
Creep Recovery ◽  
Fiber Reinforced ◽  
Impact Performance ◽  
Reinforced Polymer ◽  
Fiber Size ◽  
Resistance Performance ◽  
The Impact

In order to optimize the size of wood fiber reinforced polymer, and extend the application field of wood fiber reinforced polymer composites and improve the safety of their use, four size of wood fiber reinforced high-density polyethylene (HDPE) composites were prepared by forming mat-compression molding. The four kinds of fibers of different size include 80-120 mesh, 40-80 mesh, 20-40 mesh and 10-20 mesh fibers. The flexural performance, impact resistance performance and 24 hours creep - 24 hours recovery of the composites are studied. Fiber of 20-40 mesh presents the best flexural and impact resistance performance. The flexural strength, the elastic modulus and the impact strength reach 26.71MPa, 2.73Gpa and 6.88 KJ/m2 respectively. The impact performance of wood fiber/HDPE composites do not change a lot, while the fiber size increases from 10 to 80 mesh. However, the composites containing 80-120 mesh fibers has minimum impact performance. The creep performance of the wood fiber/HDPE composites with 80-120 mesh is the worst. After 24h creep test, the strain of the other three groups is almost the same. Creep recovery of the composites reinforced with 40-80 mesh fiber is the worst (61.74%). The creep recovery of the other three is above seven percent. Therefore, excessively large or small fiber size proves to be negative to improve the mechanical and creep performance, and polymer composites reinforced by them are not suitable for work under long-term load.

DYNAMIC IMPACT RESISTANCE OF COMPOSITE SANDWICH PANELS WITH 3-D PRINTED POLYMER SYNTACTIC FOAM CORES

2021 ◽  
Author(s):  
H. R. TEWANI ◽  
DILEEP BONTHU ◽  
H. S. BHARATH ◽  
MRITYUNJAY DODDAMANI ◽  
P. PRABHAKAR
Keyword(s):  
Impact Resistance ◽  
Syntactic Foam ◽  
Sandwich Panels ◽  
Syntactic Foams ◽  
Dynamic Impact ◽  
Impact Performance ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Back Face ◽  
The Impact

Polymer-based syntactic foams find use in the marine industry as primary structural materials due to their inherent lightweight nature and enhanced mechanical properties relative to pure HDPE. 3-D printing these materials circumvents the use of joining assemblies, enabling the production of complex shapes as standalone structures. Although the quasi-static response of these 3D printed foams has been well studied independently in recent years, their dynamic impact resistance and tolerance as potential core material for sandwich panels have not been the focus. Moreover, 3D printing is known to impart directionality in the printed syntactic foams, which may introduce failure mechanisms typically not observed in molded foams. It is therefore important to investigate the mechanics of 3-D printed syntactic foam core composite sandwich structures under impact loading and characterize their failure mechanisms for establishing dynamic impact resistance. To this end, 3-D printed syntactic foams have been developed using rasters of High-Density Polyethylene (HDPE) and Glass MicroBalloon (GMB) fillers by adopting the Fused Raster Fabrication (FFF) technique. The current study is performed to assess the impact performance of these composite foam cores based on the volume fraction of fillers and print orientation. The weight percentage of GMB fillers in printed specimens ranges from 0% to 60% in increments of 20%. This study presents the impact response of these composite sandwich panels at different energy levels, in compliance with ASTM D7136/D7136M - 20. Observations suggest that an increase in GMB % in HDPE matrix improves the impact performance in terms of the peak load of the material, but the failure behavior becomes brittle to an extent. Observing the failed specimens under a Micro-CT scanner captures the failure morphologies and helps characterize failure processes during impact. It is noticed that core materials with higher GMB content are prone to individual raster breakage and delamination at the back face, in addition to debonding between individual rasters. Specimens printed along the longer dimension (y-direction) impart more warping in the final sandwich structures than that of specimens printed along the shorter dimension (x-direction). Therefore, they are more susceptible to delamination at the back face. Addition of GMB fillers mitigate the tendency of the sandwich panels to warp.

Based on the Digital Design of the Pneumatic Pick Force Analysis and Research of Key Parts

2013 ◽  
Vol 753-755 ◽  
pp. 1347-1350
Author(s):  
Chen Shen ◽  
Hua Liang Gui ◽  
Ming Ming Wu
Keyword(s):  
Mechanical Performance ◽  
Raw Materials ◽  
Design Method ◽  
Impact Resistance ◽  
Digital Design ◽  
Working Process ◽  
Air Power ◽  
Power Machinery ◽  
Resistance Performance ◽  
The Impact

Pick is a hand-held machine of the air power machinery, using compressed air as power, hit a rundown coal and ore body or other objects. In the working process of the pneumatic pick, pick cylinder under different loading easily lead to early obsolescence. In order to improve the impact resistance performance to pick picks, prolong the service life of pneumatic pick, based on the digital design method for pneumatic pick pick cylinder is modeled, and based on the simulated stress analysis, for the process improvement, improve its mechanical performance, reduce the waste of raw materials.

Preparation and Properties of PS/PP/Nano-TiO2 Composites

2013 ◽  
Vol 750-752 ◽  
pp. 3-6
Author(s):  
Shou Wu Yu ◽  
Shu Juan Xiao ◽  
Peng Bo Zhang ◽  
Li Jie Zhang ◽  
Yu Qing Li
Keyword(s):  
Mechanical Properties ◽  
Impact Resistance ◽  
Heat Stability ◽  
Melt Index ◽  
Melt Compounding ◽  
Resistance Performance ◽  
The Impact ◽  
Addition Amount

PS/PP/nano-TiO2 composites are prepared via melt compounding method. We study on the effects of mechanical properties, rheological, heat stability and microscopic structures on the composites. Results show that the impact resistance performance, compatibility, melt index, etc are associated with the addition amount of TiO2.

scholarly journals Effects of Three Different Types of Aloin on Optical, Mechanical, and Antibacterial Properties of Waterborne Coating on Tilia europaea Surface

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1537
Author(s):  
Xiaoxing Yan ◽  
Nan Huang
Keyword(s):  
Impact Resistance ◽  
Antibacterial Properties ◽  
Color Difference ◽  
Core Material ◽  
Wall Material ◽  
Formaldehyde Resin ◽  
Waterborne Coating ◽  
Comprehensive Properties ◽  
Grade 3 ◽  
The Impact

The microcapsules were prepared by using melamine-formaldehyde resin as the wall material and aloin as the core material. The aloin was dissolved in ethanol and water to prepare microcapsules. The aloin powder, the aloin microcapsules prepared with ethanol as the solvent, and the aloin microcapsules prepared with water as the solvent were, respectively, added to the waterborne coating with different contents and coated on the surface of Tilia europaea. The effects of different modifiers and contents on the coating’s optical properties, mechanical properties, and antibacterial properties were explored. The results showed that the aloin microcapsules prepared with ethanol as the solvent had good morphology and comprehensive properties. When the content was 7.0%, the color difference of the waterborne coating was small, the adhesion was grade 3, the impact resistance was 12 kg·cm, and the antibacterial rate was 87.8%. In terms of antibacterial properties, the uncoated aloin powder, the coated aloin microcapsules prepared with ethanol as the solvent, and the aloin microcapsules prepared with water all have certain antibacterial properties and the antibacterial rates reached 99.2%, 97.3%, and 67.3%, respectively. This study provides a certain reference for developing antibacterial wood furniture coatings.

Influence Study of Reinforced Fiber on the Impact Resistance Performance of Recycled Aggregate Concrete

2011 ◽  
Vol 418-420 ◽  
pp. 250-253
Author(s):  
Lin Gao ◽  
Yan Shi ◽  
Ya Chang Liu
Keyword(s):  
Impact Resistance ◽  
Polypropylene Fiber ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Hybrid Fiber ◽  
Concrete Technology ◽  
Aggregate Concrete ◽  
Reinforced Fiber ◽  
Resistance Performance ◽  
The Impact

Recycled aggregate concrete technology has been payed widely attention. In addition to the research on the basic performance of recycled aggregate concrete, the impact resistance performance of recycled aggregate concrete was also involved. Through mixing respectively steel fiber, polypropylene fiber and steel-polypropylene hybrid fiber into the recycled aggregate concrete, the writer studied the impact resistance performance of fiber-reinforced recycled aggregate concrete, and compared the influence of reinforced fiber on the impact resistance performance of recycled aggregate concrete.

Structural design of a 3-D printed stab resistant body armor

2019 ◽  
Vol 25 (1) ◽  
pp. 143-151
Author(s):  
Zheng Gong ◽  
Xinming Qian ◽  
Mengqi Yuan
Keyword(s):  
Structural Damage ◽  
Performance Test ◽  
Structural Parameters ◽  
Body Armor ◽  
National Standard ◽  
The Novel ◽  
Content Type ◽  
Stab Resistance ◽  
New Type ◽  
The Impact

Purpose Stab-resistant body armor (SRBA) can protect the human body from injury as a result of stabbing by sharp projectiles. However, in its current design SRBA, it has not been widely adopted for use, because of its weight and poor flexibility. Herein, this paper aims to detail a new type of SRBA that is inspired by the armor plating of mammals and is fabricated using laser sintering (LS) technology. Design/methodology/approach This new type of SRBA was fabricated using LS technology. The laser sintered SRBA was subjected to a stab resistance performance test that conformed to the GA 68-2008 Chinese National Standard. The stab resistance response of the novel structured, stab resistance test plates in this study was analyzed using the using the AUTODYN explicit module in ANSYS-Workbench. Findings The structure of the novel stab resistance plate was designed and the optimum structural parameters were tested, discussed and achieved. The mechanism of dissipation of the impact energy by the pyramidal structures of the novel SRBA was studied, and it was found that this structure dispersed the kinetic energy of the knife and minimized the structural damage to the plate. Interlinks inspired by the pangolin hierarchy structure were designed and used to fabricate a large piece of laser sintered body armor. Originality/value High-performance laser sintered stab resistance plate was produced via the material and structure studies, which could reduce 40 per cent weight on the stab resistance body armor and increase the wearability.

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