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Questions and Answers
In compression molding and transfer molding, which of the following is true?
In compression molding and transfer molding, which of the following is true?
- Compression molding requires the material to be placed in an open mold cavity while transfer molding involves the transfer of material from a pot into the closed mold cavity. (correct)
- Compression molding and transfer molding both require the material to be placed in an open mold cavity.
- Neither compression molding nor transfer molding involves the transfer of material from a pot into the closed mold cavity.
- Both compression molding and transfer molding involve the transfer of material from a pot into the closed mold cavity.
Why is the tensile strength and tensile modulus considerably lower in the transverse direction compared to the longitudinal direction for the commercial unidirectional composite laminate of carbon fibers and epoxy resin?
Why is the tensile strength and tensile modulus considerably lower in the transverse direction compared to the longitudinal direction for the commercial unidirectional composite laminate of carbon fibers and epoxy resin?
- The tensile strength and modulus are independent of the fiber orientation.
- The epoxy resin used for the composite is weaker in the transverse direction.
- The manufacturing process introduces defects that weaken the composite in the transverse direction.
- The carbon fibers are oriented in a way that provides more strength in the longitudinal direction. (correct)
How could the fiber volume and load angle affect the value of modulus of elasticity based on Figure 1?
How could the fiber volume and load angle affect the value of modulus of elasticity based on Figure 1?
- Increasing fiber volume leads to a decrease, but load angle leads to an increase in the modulus of elasticity.
- Increasing fiber volume leads to an increase, but load angle leads to a decrease in the modulus of elasticity. (correct)
- Increasing fiber volume and load angle both lead to an increase in the modulus of elasticity.
- Increasing fiber volume and load angle both lead to a decrease in the modulus of elasticity.
Compare compression molding and transfer molding in terms of their processing and applications.
Compare compression molding and transfer molding in terms of their processing and applications.
Why is the tensile strength and tensile modulus considerably lower in the transverse direction compared to the longitudinal direction for the commercial unidirectional composite laminate of carbon fibers and epoxy resin?
Why is the tensile strength and tensile modulus considerably lower in the transverse direction compared to the longitudinal direction for the commercial unidirectional composite laminate of carbon fibers and epoxy resin?
Illustrate a schematic diagram to explain the behavior of the composite material in terms of tensile strength and tensile modulus in different directions.
Illustrate a schematic diagram to explain the behavior of the composite material in terms of tensile strength and tensile modulus in different directions.
How could the fiber volume and load angle affect the value of modulus of elasticity based on Figure 1?
How could the fiber volume and load angle affect the value of modulus of elasticity based on Figure 1?
Based on Figure 1, what can be inferred about the relationship between fiber volume and load angle in influencing the modulus of elasticity?
Based on Figure 1, what can be inferred about the relationship between fiber volume and load angle in influencing the modulus of elasticity?
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Study Notes
Compression Molding and Transfer Molding
- Compression molding and transfer molding are two distinct processes with differences in processing and applications.
Unidirectional Composite Laminate
- Tensile strength and tensile modulus are considerably lower in the transverse direction compared to the longitudinal direction for commercial unidirectional composite laminate of carbon fibers and epoxy resin.
- This is because the fibers are aligned in the longitudinal direction, resulting in higher strength and stiffness in that direction.
Fiber Volume and Load Angle
- Fiber volume and load angle can affect the value of modulus of elasticity, as shown in Figure 1.
- Increasing fiber volume can increase the modulus of elasticity, while changing the load angle can also impact the modulus of elasticity.
- The relationship between fiber volume and load angle is significant in influencing the modulus of elasticity.
Composite Material Behavior
- A schematic diagram can be used to illustrate the behavior of the composite material in terms of tensile strength and tensile modulus in different directions.
- The diagram would show the variation in tensile strength and modulus of elasticity with direction, highlighting the anisotropic properties of the composite material.
Inference from Figure 1
- Based on Figure 1, it can be inferred that the relationship between fiber volume and load angle is critical in influencing the modulus of elasticity of the composite material.
- The figure suggests that optimizing fiber volume and load angle can lead to improved mechanical properties of the composite material.
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