Pressure effects and fracture of a rubbery particulate composite

Miller, Thomas B.; Liu, C. T.

doi:10.1007/bf02323142

Cited by 7 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental findings reveal that cracks grow slower under confined pressure. The decrease in crack growth rate under confined pressure is due to the suppression of the development of damage in the material and the decrease in strain gradient near the crack tip (1)(2)(3)(4)(5)(6). The experimental findings also reveal that, after the crack propagates, the growth behavior of the two initial crack lengths considered are similar.…”

Section: Summary Of Accomplishments: Task 1: Investigating the Effectmentioning

confidence: 73%

“…The objectives of this program are to : (1) gain a fundamental understanding of fracture and crack growth behavior in solid rocket motors; (2) investigate the effects of damage, material nonlinearity, pressure, and loading rate on crack growth behavior in a solid propellant; (3) simulate crack growth behavior and gain insight for improving crack growth resistance in solid propellants; and (4) determine the strain rate effect on the constitutive and fracture behavior of bi-material bond systems. The main issues in service life prediction of solid rocket motors are the lack of a fundamental understanding of crack growth behavior under service loading conditions and a reliable methodology to predict crack growth.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Material Mechanics Research

Liu¹

2003

Self Cite

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force Research Laboratory (AFMC) AFRL/PRSM SPONSOR/MONITOR'S REPORT10 E. Saturn Blvd. NUMBER(S)Edwards AFB CA 93524-7680 AFRL-PR-ED-TR-2003-0006 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited; February 2003. SUPPLEMENTARY NOTES ABSTRACTThis report covers results of research addressing cumulative damage and crack growth behavior in a solid propellant and interfacial fracture of bi-material bonded systems. The program's basic approach involves a blend of analytical and experimental studies. In general, mechanisms and mechanics involved in cohesive fracture in the solid propellant and adhesive fracture in the bi-material bonded systems are emphasized. The results of both analytical and experimental analyses are evaluated and discussed. SUBJECT TERMS

show abstract

Section: Summary Of Accomplishments: Task 1: Investigating the Effectmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Material Mechanics Research

Liu¹

2003

Self Cite

View full text Add to dashboard Cite

show abstract

“…Researchers [21,22] found that the ultimate mechanical properties of Hydroxy‐Terminated Polybutadiene (HTPB) propellants also behave with strong pressure sensitivity. The effect of pressure on crack growth behavior of solid propellants was discussed by Liu and Miller [23, 24]. The results showed that the crack growth rate decreases with increasing the confining pressure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

Chen

Hou

et al. 2021

Propellants Explo Pyrotec

View full text Add to dashboard Cite

In order to study the effects of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant, compressive tests were conducted under various confining pressure conditions and strain rates using a new‐designed active gas confining pressure testing machine. The stress‐strain curves and mechanical properties of the NEPE propellant under varying confining pressure conditions and strain rates were obtained. The results show that the compressive mechanical properties of the NEPE propellant are remarkably influenced by the confining pressure and strain rate. The compressive strength under confining pressure is obviously larger than those without applied confining pressure. With the coupled effects of the confining pressure and strain rate, the compressive strength under 5.4 MPa and 6.67×10−2 s−1 is 2.17 times of its value at room condition and 6.67×10−4 s−1. Then, based on previous tensile results, the quantified comparisons of tensile and compressive mechanical properties under different experimental conditions were presented. Finally, a nonlinear constitutive model with damage was constructed to model the effect of pressure. The statistical damage model parameters were defined as ExpDec1 function of pressure P. The calibrated model can accurately predict the mechanical behaviour of the NEPE propellant under different confining pressure conditions and strain rates.

show abstract

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

View full text Add to dashboard Cite

To study the tensile mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant under varying confining pressure conditions, uniaxial tensile tests were conducted under different strain rates (from 0.0006667 s−1 to 0.06667 s−1) and confining pressure conditions (from relative atmospheric pressure up 5.4±0.03 MPa) using a new‐designed confining pressure testing machine. Scanning electron microscopy (SEM) was employed to observe the tensile fracture surfaces. The mechanical properties and damage processes of the NEPE propellant under varying confining pressure conditions were studied and analysed. The results indicate that the mechanical properties of propellant materials are remarkably influenced by the varying confining pressure conditions. The ultimate strain and maximum tensile stress increase with increasing confining pressure. Moreover, the maximum tensile stress present a linear‐log relationship with the strain rate under various confining pressure conditions. Yet, the confining pressure has no obvious effect on the initial elastic modulus. The reason for the change of the mechanical properties of the NEPE propellant is that confining pressure delays the initiation and development of damage under the tensile loading. Based on the time‐pressure superposition principle (TPSP), the master curve of maximum tensile strength of the NEPE propellant was constructed. Furthermore, the results can provide a theoretical foundation for the analysis of the structural integrity of propellant grains of a SRM under ignition conditions. Finally, a constitutive model considering compressibility of propellant materials can be constructed.

show abstract

Pressure effects and fracture of a rubbery particulate composite

Cited by 7 publications

References 15 publications

Material Mechanics Research

Material Mechanics Research

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Contact Info

Product

Resources

About