Analysis And Design Of Composite Structures at TU München | Flashcards & Summaries

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Lernmaterialien für Analysis and Design of Composite Structures an der TU München

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What is delamination?

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describes the fracture between 2 adjacent layers of a laminate

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Explain the independent criteria

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- no interaction between the different stress/strain components

- the failure mode can be predicted

- generally good prediction if failure is dominated by 1 stress component

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TESTE DEIN WISSEN

What are continuum shell elements?

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• Topology of a continuum element (three displacement degrees
of freedom per node)
• Kinematic of a shell element


The thickness of a continuum shell element is defined by the nodes, thus is not an input-parameter as for shells.
Implemented in commercial FE codes like Marc and Mentat and
Abaqus

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TESTE DEIN WISSEN

Which 2 failure modes can occur for IIF

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TESTE DEIN WISSEN

adhesive failure of the fiber-matrix interface

cohesive failure og the matrix

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TESTE DEIN WISSEN

Lamina failure can be divided into 3 Criteria. Name them with examples and describe it

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TESTE DEIN WISSEN

- independent criteria (eg. Maximum stress, maximum strain)

-> no interachtion between different stress/strain component. The failure mode can be predicted. Failure analysis is often not conservative

- fully interactive criteria (eg. Tsai-Wu, Hoffman)

-> all the different stresses are combined in a single eq. The failure mode cannot be predicted

- party interactive criteria (eg Hashin, Puck)

-> Failure function is represented by differenet eq. Hence, these criteria allow a distinction between failure modes and physically plausible interaction of different stresses

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TESTE DEIN WISSEN

3 Drawbacks and 2 advantages of the Tsai-Wu criterion

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TESTE DEIN WISSEN

- pure mathematical interpolation equation (physically questionalble dependencies

- no prediction of falure mode

- interaction tern f12 is difficult to determine


+ easy to use and to implement

+ single equation for the fracture body

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TESTE DEIN WISSEN

3.1 What has to be kept in mind when calculating the failure index?

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TESTE DEIN WISSEN

Does not say anything about the risk of failure! ->see stress exposure

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TESTE DEIN WISSEN

Name 4 examples for quasi-isotropic laminates. What is special in the ABD Matrices?

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TESTE DEIN WISSEN

A laminate with n ≥ 3 plies of equal thickness and ply angle shifts of pi/n

ex.

(0/+45/-45/90)s

(-60/0/60)

(0/-45/45/90)

(0/30/60/90/-30/-60)


No A16, A26 and B entities! B 0 if symmetric

Lösung ausblenden
TESTE DEIN WISSEN

What are the inputs and the results of a CLT analysis?

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TESTE DEIN WISSEN

• Input: laminate loads (forces or moments)
• Results: stresses and strains in all plies, stiffness of the laminate

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TESTE DEIN WISSEN

Name 2 factors which influence the support of the fiber in compression

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TESTE DEIN WISSEN

- stiffer matix material (The compressive strength of a UD lamina can be enhanced nearly proportional with the matrix shear modulus)

- less fiber misalignment (Local misalignment of the fibers drastically reduces the compressive strength)

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TESTE DEIN WISSEN

1.4 What are the 3 challenges in the composite sector?

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- application of material acc to fiber and manufacturing req (include "design to process" in "design to fiber")

- recycling

- crash simulation

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5.2 Name 3 critiques on Volkersen

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TESTE DEIN WISSEN

1. peel loads are neglected (though adhesive joints are prone to fail unter peel) see Goland&Reissner

2. Load eccentricity is not accounted for (though any single lap join will geometrically induce eccentricity and as a result bending moments and peel stress) see Goland&Reissner

3. Linear elastic adhesive behavior (though most structural adhesive show highly non.linear behavior) see Hart&Smith

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Q:

What is delamination?

A:

describes the fracture between 2 adjacent layers of a laminate

Q:

Explain the independent criteria

A:

- no interaction between the different stress/strain components

- the failure mode can be predicted

- generally good prediction if failure is dominated by 1 stress component

Q:

What are continuum shell elements?

A:

• Topology of a continuum element (three displacement degrees
of freedom per node)
• Kinematic of a shell element


The thickness of a continuum shell element is defined by the nodes, thus is not an input-parameter as for shells.
Implemented in commercial FE codes like Marc and Mentat and
Abaqus

Q:

Which 2 failure modes can occur for IIF

A:

adhesive failure of the fiber-matrix interface

cohesive failure og the matrix

Q:

Lamina failure can be divided into 3 Criteria. Name them with examples and describe it

A:

- independent criteria (eg. Maximum stress, maximum strain)

-> no interachtion between different stress/strain component. The failure mode can be predicted. Failure analysis is often not conservative

- fully interactive criteria (eg. Tsai-Wu, Hoffman)

-> all the different stresses are combined in a single eq. The failure mode cannot be predicted

- party interactive criteria (eg Hashin, Puck)

-> Failure function is represented by differenet eq. Hence, these criteria allow a distinction between failure modes and physically plausible interaction of different stresses

Mehr Karteikarten anzeigen
Q:

3 Drawbacks and 2 advantages of the Tsai-Wu criterion

A:

- pure mathematical interpolation equation (physically questionalble dependencies

- no prediction of falure mode

- interaction tern f12 is difficult to determine


+ easy to use and to implement

+ single equation for the fracture body

Q:

3.1 What has to be kept in mind when calculating the failure index?

A:

Does not say anything about the risk of failure! ->see stress exposure

Q:

Name 4 examples for quasi-isotropic laminates. What is special in the ABD Matrices?

A:

A laminate with n ≥ 3 plies of equal thickness and ply angle shifts of pi/n

ex.

(0/+45/-45/90)s

(-60/0/60)

(0/-45/45/90)

(0/30/60/90/-30/-60)


No A16, A26 and B entities! B 0 if symmetric

Q:

What are the inputs and the results of a CLT analysis?

A:

• Input: laminate loads (forces or moments)
• Results: stresses and strains in all plies, stiffness of the laminate

Q:

Name 2 factors which influence the support of the fiber in compression

A:

- stiffer matix material (The compressive strength of a UD lamina can be enhanced nearly proportional with the matrix shear modulus)

- less fiber misalignment (Local misalignment of the fibers drastically reduces the compressive strength)

Q:

1.4 What are the 3 challenges in the composite sector?

A:

- application of material acc to fiber and manufacturing req (include "design to process" in "design to fiber")

- recycling

- crash simulation

Q:

5.2 Name 3 critiques on Volkersen

A:

1. peel loads are neglected (though adhesive joints are prone to fail unter peel) see Goland&Reissner

2. Load eccentricity is not accounted for (though any single lap join will geometrically induce eccentricity and as a result bending moments and peel stress) see Goland&Reissner

3. Linear elastic adhesive behavior (though most structural adhesive show highly non.linear behavior) see Hart&Smith

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