Low temperature transitions in fibre reinforced polymers

Adams, Robert D.; Singh, MM

doi:10.1016/s1359-835x(00)00185-8

Cited by 32 publications

(17 citation statements)

References 39 publications

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“…Causes of transitions T β and T γ are not very well understood but are also believed to be due to chain rearrangement. 2,3 Early in the polymer composite history, empirical relations modelled after tests on epoxy resin systems were proposed by Chamis to evaluate mechanical properties of polymers under the influence of temperature lower than T g and absorbed moisture. 4,5 Chamis' relation suggests a change in polymer mechanical properties proportional to the square root of the difference between T gw , the moisture degraded glass transition temperature of the matrix, and T , the actual temperature.…”

Section: Iia1 Constituent Scale Effectsmentioning

confidence: 99%

Temperature and Frequency Effects on the Fatigue Properties of Unidirectional Glass Fiber-Epoxy Composites

Cormier¹,

Nijssen²,

Raijmaekers³

2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

2
1
3
0

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As wind turbines are likely to be installed in a wide variety of environments, knowledge of their materials mechanical properties under extreme environments is needed. The project presented herein aims at evaluating the effects of temperatures of -40 ℃, 23 ℃, and 60 ℃ on the static properties and fatigue lives of unidirectional glass-epoxy composites as found in wind turbine blades load bearing structures. Tensile and compressive static properties, as well as fatigue lives under R = 0.1 and R = −1 loading are evaluated. Moreover, in an attempt to reduce future tests time by using the highest frequency possible, efforts are spent in evaluating the effects of loading frequency on specimen fatigue lives. Frequencies ranging from 1 Hz to 24 Hz are studied. Results show that even if the static strength of the composite is much improved at low temperature, this does not translate to improved fatigue performances and may actually cause a reduction of fatigue lives. On the other hand, static strength degradation at higher temperatures does equate to a significant reduction in fatigue life. This is particularly true for fully reversed fatigue loading. It is also shown that higher loading frequencies are rapidly deleterious at room and elevated temperatures. However, considering the limited effect of low temperatures on fatigue performances, it is believed that cooling could be coupled to higher frequencies in order to accelerate fatigue testing.

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Section: Iia1 Constituent Scale Effectsmentioning
confidence: 99%

Temperature and Frequency Effects on the Fatigue Properties of Unidirectional Glass Fiber-Epoxy Composites
Cormier¹,
Nijssen²,
Raijmaekers³
2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
2
1
3
0
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“…The second method measures the shear modulus on a bulk specimen using a torsional pendulum. The apparatus used is shown in Figure 4.6 [3]. The bulk adhesive beam is held vertical, being clamped at its base.…”

Section: Dynamic Shear Modulusmentioning
confidence: 99%

Higher Rate and Impact Tests
Silva
¹
,
Adams
²
,
Blackman
³

et al. 2012
Testing Adhesive Joints
8
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16
0
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“…The dependence of composite materials modulus and stiffness on tempera-25 ture is well known and documented [9, 10,11]. As temperature increases, the polymer Young's modulus suffers a transition from 'glass-like' to 'rubber-like' and the abrupt drop in modulus takes place at the glass transition temperature, denoted as T g .…”

Section: Introductionmentioning
confidence: 99%

Measuring the intralaminar crack resistance curve of fibre reinforced composites at extreme temperatures
Pinto
¹
,
Catalanotti
²
,
Camanho
³

2016
Composites Part A: Applied Science and Manufacturing
13
0
7
0
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Low temperature transitions in fibre reinforced polymers

Cited by 32 publications

References 39 publications

Temperature and Frequency Effects on the Fatigue Properties of Unidirectional Glass Fiber-Epoxy Composites

Temperature and Frequency Effects on the Fatigue Properties of Unidirectional Glass Fiber-Epoxy Composites

Higher Rate and Impact Tests

Measuring the intralaminar crack resistance curve of fibre reinforced composites at extreme temperatures

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