Temperature effect on non-stationary compressive loading response of polymethacrylimide solid foam

Grace, Ihab M.; Pilipchuk, Valery N.; Ibrahim, R. A.; Ayorinde, Emmanuel O.

doi:10.1016/j.compstruct.2012.04.022

Cited by 31 publications

(23 citation statements)

References 24 publications

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“…The authors also reported a decrease of elastic strength with temperature (particularly between À60°C and 22°C), this effect being reduced at higher loading speeds. In these two studies the authors did not specify the glass transition temperature (T g ) of the PMI foams; however, Grace et al [10] mentioned that the maximum test temperature used was well below the T g of PMI foam. This seems to be confirmed by Weiser et al [11], according to whom the maximum operating temperatures of those foam grades are respectively 177°C and 121°C.…”

Section: Introductionmentioning

confidence: 97%

“…The authors reported reductions of 31% and 35% respectively in the shear and compressive strengths when the temperature was increased from RT (the exact temperature value was not reported) to 70°C. Grace et al [10] studied a similar PMI foam (industrial grade), subjected to uniaxial compressive tests at temperatures of À60°C, 22°C and 60°C, loaded at different speeds. The authors also reported a decrease of elastic strength with temperature (particularly between À60°C and 22°C), this effect being reduced at higher loading speeds.…”

Section: Introductionmentioning

confidence: 99%

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Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Garrido

Correia

Keller

2015

Construction and Building Materials

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Garrido

Correia

Keller

2015

Construction and Building Materials

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“…Effect of temperature on the loading response of PVC and PMI foams has been studied experimentally by Grace et al [14], Zhang et al [15] and Arezoo et al [16]. Based on their results, it has been shown that the strength and stiffness of the foam becomes higher at low temperatures.…”

Section: Hygrothermal Effects On Pmi Foam and Its Sandwich Structuresmentioning

confidence: 94%

Effect of temperature and humidity conditions on polymethacrylimide (PMI) foam core material and indentation response of its sandwich structures

Siivola

Minakuchi

Takeda

2015

Jnl of Sandwich Structures & Materials

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Foam core sandwich structures are rather vulnerable against transverse loading which can leave only barely visible damage in the structures. Environmental conditions can further affect the loading response and thus the formation of damage. To study this, uniaxial compression-tension loading tests were conducted at 30, 60 and 80 C temperatures using polymethacrylimide (PMI) foam specimens conditioned at three distinct humidity conditions (dry, ambient and wet) before testing. Effect of the conditions on the mechanical properties and loading response of the foam was studied. Strength and stiffness of the foam degraded with increasing temperature and humidity with the combined effect of these conditions being even more severe than either one alone. Indentation tests of polymethacrylimide foam core composite sandwich beams with composite face sheets were also conducted at the same temperature and humidity conditions. The indentation response was seen to correlate with the compressive response of the foam material.

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“…Because the damage occurs in the core of the sandwich structure, Grace et al (2012) presented experimental investigation and modeling of the PMI foam response under slightly nonstationary compressive loads at different loading speed and temperature. For all conditions, the strain-stress curves exhibit three definite regions: linearly elastic, plateau, and densification as it is known from the literature.…”

Section: Damage Of Composite Structuresmentioning

confidence: 99%

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

Ibrahim¹

2015

j ship prod des

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Structural life assessment periodically evaluates the state and condition of a structural system and provides recommendations for possible maintenance actions or the end of structural service life. It is a diversified field and relies on the theories of fracture mechanics, fatigue damage process, probability of failure, and reliability. With reference to naval ship structures, their life assessment is not only governed by the theory of fracture mechanics and fatigue damage process, but by other factors such as corrosion, grounding, and sudden collision. The purpose of this series of review articles is to provide different issues pertaining to structural life assessment of ships and ocean structures. Part I deals with the basic ingredients of the theory of fracture mechanics, which is classified into linear elastic fracture mechanics and elasto-plastic fracture mechanics. The amount of energy available for fracture is usually governed by the stress field around the crack, which is measured by the stress intensity factor. The value of the stress intensity factor, which depends on the loading mode, is evaluated by different methods developed by many researchers. The applications of the theory of fracture mechanics to metallic and composite structures are presented with an emphasis to those used in marine structures. When the inertia of relatively large pieces of a structure is large enough that the correct balancing of the energy of fracture requires the inclusion of kinetic energy, then the dynamic nature of fracture dominates the analysis. For a crack that is already propagating, the inertial effects are important when the crack tip speed is small compared with the stress wave velocities. This fact has been realized in the theory of fracture mechanics under the name of dynamic fracture and peridynamic. In essence, peridynamic replaces the partial differential equations of classic continuum theories with integro-differential equations as a tool to avoid singularities arising from the fact that partial derivatives do not exist on crack surfaces and other singularities. A brief overview of fracture dynamics and peridynamics together with damage mechanisms in composite structures is presented. The limitations of fracture mechanics criteria are also discussed. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure, which are addressed in Part II. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure. In view of structural parameter uncertainties, probabilistic analysis requires the use of reliability methods for assessing fatigue life by considering the crack propagation process and the first passage problem, which measures the probability of the exit time from a safe operating regime. The main results reported in the literature pertaining to ship structural damage assessments resulting from to slamming loads, liquid sloshing impact loads of liquefied natural gas in ship tankers, and ship grounding accidents, an...

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Temperature effect on non-stationary compressive loading response of polymethacrylimide solid foam

Cited by 31 publications

References 24 publications

Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Effect of temperature and humidity conditions on polymethacrylimide (PMI) foam core material and indentation response of its sandwich structures

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

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