A method for verification of a pendulum impact tester and and implementing device

1991 ◽  
Vol 34 (6) ◽  
pp. 591-592
Author(s):  
G. �. Finkel'shtein ◽  
G. V. Potoplyak
Keyword(s):  
Impact Tester ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Morphology and Mechanical Properties of Natural Rubber-PCL Core-Shell/PLA Composites

2013 ◽  
Vol 747 ◽  
pp. 745-748
Author(s):  
Warangkhana Phromma ◽  
Rathanawan Magaraphan
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Core Shell ◽  
Dynamic Mechanical Analyzer ◽  
Admicellar Polymerization ◽  
Twin Screw ◽  
Impact Tester ◽  
The Impact ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Natural rubber (NR)/Polycaprolactone (PCL) core-shell (NR-ad-PCL), from admicellar polymerization, was as an impact modifier for the composites. PLA was mixed with NR-ad-PCL with different NR-ad-PCL contents at 5, 10, 15 and 20 wt%. PLA-based composites were prepared by co-rotating twin screw extruder. The morphology of the composites was observed by Field emission scanning electron microscope (FE-SEM). Mechanical properties of the composites were investigated by dynamic mechanical analyzer and pendulum impact tester. The impact strength of the PLA filled with NR-ad-PCL increased while modulus of the PLA composites decreased with increasing rubber contents.

scholarly journals Effect of Three-dimensional Printing with Nanotubes on Impact Resistance

2019 ◽  
Author(s):  
Anne Schmitz
Keyword(s):  
Mechanical Properties ◽  
Lower Limb ◽  
Impact Resistance ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Impact Tester ◽  
The Impact ◽  
Dimensional Printing ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Abstract The types of biomedical devices that can be three-dimensional printed (3DP) is limited by the mechanical properties of the resulting materials. As a result, much research has focused on adding carbon nanotubes (CNT) to these photocurable polymers to make them stronger. However, there is little to no data on how CNTs affect the impact resistance of these polymers, an important property when designing and manufacturing lower limb prosthetics. The objective of this study was to expand the use of 3DP to prosthetics by testing the hypothesis that adding CNTs to a stereolithographic (SLA) photocurable resin will result in a cured polymer with increased impact resistance. Twenty-six total specimens: 13 with nanotubes and 13 without nanotubes, were printed on a Form2 SLA printer. Once all the specimens were printed, washed, and cured, the impact resistance was quantified using a pendulum impact tester in a notched Izod configuration. Contrary to the hypothesis, the specimens with SWCNTs (0.312 ± 0.036 ft*lb/in) had a significantly lower impact resistance compared to the non-SWCNT specimens (0.364 ± 0.055 ft*lb/in), U = 34.0, p = 0.004. This decreased impact resistance may be due to voids in the printed polymer around the aggregated nanotubes. Thus, SLA polymers still do not have the impact strength needed to be used for a full lower limb prosthetic.

Attachment to a pendulum impact tester

1972 ◽  
Vol 15 (10) ◽  
pp. 1500-1502
Author(s):  
L. Yu. Pruzhanskii
Keyword(s):  
Impact Tester ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Effect of Three-Dimensional Printing With Nanotubes on Impact and Fatigue Resistance

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Anne Schmitz
Keyword(s):  
Fatigue Resistance ◽  
Impact Resistance ◽  
Three Dimensional ◽  
Impact Testing ◽  
Three Dimensional Printing ◽  
Impact Tester ◽  
The Impact ◽  
Dimensional Printing ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Abstract The types of biomedical devices that can be three-dimensional printed (3DP) are limited by the mechanical properties of the resulting materials. As a result, much research has been focused on adding carbon nanotubes (CNT) to these photocurable polymers to make them stronger. The objective of this study was to expand the use of 3DP to prosthetics by testing the hypothesis that adding CNTs to a stereolithographic (SLA) photocurable resin will result in a cured polymer with increased impact and fatigue resistance. For impact testing, twenty-six total specimens, 13 with nanotubes and 13 without nanotubes, were printed on a Form2 SLA printer. Once all the specimens were printed, washed, and cured, the impact resistance was quantified using a pendulum impact tester using a notched Izod configuration. Similarly, twelve R. R. Moore fatigue specimens were printed, washed, and cured. The specimens with SWCNTs (0.312 ± 0.036 ft lb/in.) had a significantly lower impact resistance compared to the non-SWCNT specimens (0.364 ± 0.055 ft lb/in.), U = 34.0, p = 0.004. Adding SWCNTs also reduced the short cycle fatigue life (i.e., 103) from 3.1 × 5 to 8.8 × 3 psi and increased the endurance limit from 0.4 to 3.0 × 3 psi. If used for creating a foot prosthetic, the non-SWCNT polymer would last 2919 cycles while the SWCNT mixture would last <1 cycle. Therefore, SLA polymers do not yet have the impact and fatigue resistance capabilities to be used for prosthetic feet.

Study of Synergistic Effects of Cerium Oxide on Intumescent Flame Retardant Polypropylene System

2014 ◽  
Vol 887-888 ◽  
pp. 90-93
Author(s):  
Ya Li Wang ◽  
Xiao Ping Tang ◽  
Xu Dong Tang
Keyword(s):  
Flame Retardant ◽  
Cerium Oxide ◽  
Synergistic Effects ◽  
Intumescent Flame Retardant ◽  
Limiting Oxygen Index ◽  
Reasonable Amount ◽  
Melamine Salt ◽  
Impact Tester ◽  
Synergistic Agent ◽  
Pendulum Impact

Melamine salt of pentaerythritol phosphate (PPM) was synthesized with phosphoric acid, pentaerythritol and melamine. This flame retardant polypropylene containing cerium oxide (CeO2) can be used as a synergistic agent for the flame retardancy of intumescent flame retardant polypropylene system. The pendulum impact tester and universal material machine were used to evaluate the mechanical properties of intmescent flame retardant system, the limiting oxygen index (LOI), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were used to evaluate the synergistic effects of CeO2. The LOI value of the system increased when reasonable amount of CeO2 was added, and it reached maximum (30%) when the mass fraction of PPM was 20% and CeO2 added was 1% of the PPM/PP system. The TGA data shows that CeO2 can enhance the thermal stability of the intumescent flame retardant polypropylene system at high temperature and effectively increase the char residue formation. The morphological structures observed with SEM demonstrate that reasonable amount of CeO2 can improve the morphologies of intumescent char layer and the properties of heat insulation and barrier material. The reasonable amount of CeO2 in the system can increase its impact strength and decrease its tensile properties.

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