scholarly journals A investigation on unixial and quasi-biaxial tensile mechanical properties of aging HTPB propellant under dynamic loading at low temperature

2018 ◽  
Author(s):  
Leiguang Duan ◽  
Guang Wang ◽  
Guoxing Zhang ◽  
Xinya Sun ◽  
Hehao Shang
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Dynamic Loading ◽  
Biaxial Tensile ◽  
Htpb Propellant

Tensile Mechanical Properties of HTPB Propellant at Low Temperature

2018 ◽  
Vol 765 ◽  
pp. 54-59 ◽  
Author(s):  
Xiang Dong Chen ◽  
Xin Long Chang ◽  
You Hong Zhang ◽  
Bin Wang ◽  
Qing Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Low Temperature ◽  
Strain Rate ◽  
Structural Integrity ◽  
Master Curves ◽  
Initial Modulus ◽  
Static Mechanical ◽  
Htpb Propellant ◽  
Integrity Analysis

To study the low temperature effects of tensile mechanical properties on Hydroxyl-terminated polybutadiene (HTPB) propellant, a quasi-static mechanical experiment was conducted. The results show that tensile mechanical parameters are closely related to strain rate and low temperature. With the decrease of temperature and increase of strain rate, the modulus and tensile strength of HTPB propellant increase obviously. Based on the time-temperature equivalence principle (TTEP), the master curves of tensile strength and initial modulus for HTPB propellant were obtained, which can facilitate the structural integrity analysis of the propellant. The damage of propellant is matrix tearing and dewetting between the filled particles and matrix.

Experimental Study on Low Temperature Mechanical Properties of HTPB Propellant

2013 ◽  
Vol 310 ◽  
pp. 124-128 ◽  
Author(s):  
Xiao Jun Zhang ◽  
Xin Long Chang ◽  
Shi Ying Zhang ◽  
Jie Tang Zhu
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Tensile Test ◽  
Room Temperature ◽  
Maximum Stress ◽  
Tensile Tests ◽  
Maximum Tensile Stress ◽  
Uniaxial Tensile ◽  
Stress Strain ◽  
Htpb Propellant

In order to investigate low temperature mechanical characteristics of HTPB (hydroxy-terminated polybutadiene binder) propellant, uniaxial tensile tests at both the low temperature and room temperature after short storage at low temperature were conducted and SEM (scanning electron microscopy) was used to observe fracture surfaces. The mechanical properties and stress-strain curves were obtained. The experimental results show that matrix tearing and particle brittle fracture occur in low temperature tensile test, but only particle/matrix interface de-wetting in room temperature tensile test. Low temperature stress-strain curves of propellant appear obviously yield region, and the yield degree is involved to the low temperature value. The low temperature mechanical properties such as maximum tensile stress, elastic modulus and strain at maximum stress against temperature are different from room temperature mechanical properties.

scholarly journals Biaxial compression mechanical properties of HTPB propellant under dynamic loading

AIP Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 015306
Author(s):  
Tingjing Geng ◽  
Hongfu Qiang ◽  
Zhejun Wang ◽  
Xueren Wang ◽  
Chunguo Yue
Keyword(s):  
Mechanical Properties ◽  
Dynamic Loading ◽  
Biaxial Compression ◽  
Htpb Propellant

scholarly journals Low-Temperature Mechanical Properties of High-Density and Low-Density Polyethylene and Their Blends

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1821
Author(s):  
Ildar I. Salakhov ◽  
Nadim M. Shaidullin ◽  
Anatoly E. Chalykh ◽  
Mikhail A. Matsko ◽  
Alexey V. Shapagin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Impact Strength ◽  
Relative Elongation ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Elongation At Break ◽  
Subzero Temperatures ◽  
Izod Impact

Low-temperature properties of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and their blends were studied. The analyzed low-temperature mechanical properties involve the deformation resistance and impact strength characteristics. HDPE is a bimodal ethylene/1-hexene copolymer; LDPE is a branched ethylene homopolymer containing short-chain branches of different length; LLDPE is a binary ethylene/1-butene copolymer and an ethylene/1-butene/1-hexene terpolymer. The samples of copolymers and their blends were studied by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), 13С NMR spectroscopy, and dynamic mechanical analysis (DMA) using testing machines equipped with a cryochamber. It is proposed that such parameters as “relative elongation at break at −45 °C” and “Izod impact strength at −40 °C” are used instead of the ductile-to-brittle transition temperature to assess frost resistance properties because these parameters are more sensitive to deformation and impact at subzero temperatures for HDPE. LLDPE is shown to exhibit higher relative elongation at break at −45 °C and Izod impact strength at −20 ÷ 60 °C compared to those of LDPE. LLDPE terpolymer added to HDPE (at a content ≥ 25 wt.%) simultaneously increases flow properties and improves tensile properties of the blend at −45 °C. Changes in low-temperature properties as a function of molecular weight, MWD, crystallinity, and branch content were determined for HDPE, LLDPE, and their blends. The DMA data prove the resulting dependences. The reported findings allow one to understand and predict mechanical properties in the HDPE–LLDPE systems at subzero temperatures.

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