Determination of mechanical properties of plastic films ? Design calculations for some plastic film structures

1966 ◽  
Vol 1 (2) ◽  
pp. 110-113
Author(s):  
O. F. Shlenskii ◽  
L. M. Dubin
Keyword(s):  
Mechanical Properties ◽  
Plastic Film ◽  
Plastic Films ◽  
Design Calculations

scholarly journals Effects of Tensile Stress and Soil Burial on Mechanical and Chemical Degradation Potential of Agricultural Plastic Films

2020 ◽  
Vol 12 (19) ◽  
pp. 7985 ◽  
Author(s):  
Yanan Han ◽  
Min Wei ◽  
Xiaoyan Shi ◽  
Dong Wang ◽  
Xulong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Tensile Stress ◽  
Film Surface ◽  
Sustainable Land Use ◽  
Chemical Degradation ◽  
Plastic Film ◽  
Biodegradable Film ◽  
Plastic Films ◽  
Soil Burial

Plastic film mulching is widely practiced in arid and semiarid farming systems, but the accumulation of plastic residues in soils can negatively affect soil properties. Therefore, efficient means of plastic film degradation are urgently needed to mitigate its unfriendly environmental impacts for sustainable land use. Here, we characterized the effects of tensile stress (TS) and soil burial (SB) on potential degradation properties of three film types: Polyethylene film (PEF), oxo-biodegradable film (OBDF), and biodegradable film (BDF). Weight loss, mechanical properties, hydrophilicity, functional groups, and crystallinity were recorded after TS and SB treatments. The results indicated that: (1) Weight loss of plastic films was associated with SB, although the extent of weight loss depended on film type and was highest in BDF, (2) application of TS before SB weakened the mechanical properties of the films and increased their hydrophilicity, creating favorable conditions for the settlement of microorganisms on the film surface, (3) PEF treated with TS and SB had higher functional group indices and lower crystallinity. Our results highlighted that the combination of TS and SB has the potential to accelerate plastic film degradation.

scholarly journals PENGARUH WAKTU SIMPAN FILM PLASTIK BIODEGRADASI DARI PATI KULIT SINGKONG TERHADAP SIFAT MEKANIKALNYA

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Fauzi Akbar ◽  
Zulisma Anita ◽  
Hamidah Harahap
Keyword(s):  
Mechanical Properties ◽  
Storage Time ◽  
Thin Sheet ◽  
Biodegradable Plastics ◽  
Plastic Film ◽  
Elongation At Break ◽  
Plastic Films ◽  
Plasticizer Migration ◽  
Cassava Peel ◽  
Main Material

Biodegradable plastics are plastics that will decompose in nature with the help of microorganisms. The use of starch as the main material of plastic manufacturing has great potential because in Indonesia there are different starch crops. To obtain bioplastics, starch is added to the plasticizer glycerol, in order to obtain a more flexible plastic and elastic. This study reviews the use of cassava starch and glycerol skin as a base for the manufacture of biodegradable plastics. The purpose of this research is to know the effect of storage time on the mechanical properties of plastic film biodegradation of starch cassava peel. The results obtained in the form of a thin sheet plastic film that have been tested mechanical properties such as tensile strength, elongation at break, and elasticity. Mechanical properties of plastic films will decrease every week due to the absorption of moisture and plasticizer migration occurs in a matrix of plastic films for storage.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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