teaching displacement concepts using computer programs skylar l. primm and basil tikoff november 9,...
TRANSCRIPT
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Teaching displacement concepts using computer
programs
Teaching displacement concepts using computer
programs
Skylar L. Primm and Basil Tikoff
November 9, 2004
Skylar L. Primm and Basil Tikoff
November 9, 2004
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IntroductionIntroduction
Problem:– Stress and strain are hard concepts for students
in introductory structural geology courses to grasp
– Difficulty in visualizing progressive deformation is a prime reason
Problem:– Stress and strain are hard concepts for students
in introductory structural geology courses to grasp
– Difficulty in visualizing progressive deformation is a prime reason
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IntroductionIntroduction
Problem:– Interactive computer programs have been
successful at demonstrating these concepts to students
– These programs were written for legacy systems and no longer work on modern computers
Problem:– Interactive computer programs have been
successful at demonstrating these concepts to students
– These programs were written for legacy systems and no longer work on modern computers
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IntroductionIntroduction
Our Solution:– Rewrite these programs, improving and
updating them for modern PCs– Add new programs to the suite, covering a
wider range of displacement concepts– Utilize the Java programming language for
maximum compatibility– Make the programs downloadable
Our Solution:– Rewrite these programs, improving and
updating them for modern PCs– Add new programs to the suite, covering a
wider range of displacement concepts– Utilize the Java programming language for
maximum compatibility– Make the programs downloadable
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RotationDistortion Translation
Displacement Fields
Rock Fabric
Finite Strain
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Rotation Translation
Shear Fabric
Rotating Clasts
Flow Lines
Distortion
Shear Box
Stress v. Strain
Strain Theory
3D Strain
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Shear BoxShear Box
2D v. 3D Main Point: Progressive finite strain Relevant Concepts:
– Finite strain– Progressive distortion and rotation of material
lines
2D v. 3D Main Point: Progressive finite strain Relevant Concepts:
– Finite strain– Progressive distortion and rotation of material
lines
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Shear BoxShear Box
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Stress v. StrainStress v. Strain
2D v. 3D Main Point: Difference between axes of
stress and finite strain Relevant Concepts:
– Finite strain– Stress (assuming viscous medium)
2D v. 3D Main Point: Difference between axes of
stress and finite strain Relevant Concepts:
– Finite strain– Stress (assuming viscous medium)
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Strain TheoryStrain Theory
2D v. 3D Main Point: Synthesis of advanced concepts
in progressive finite strain Relevant Concepts:
– Finite strain– Infinitesimal strain– Flow apophyses– Kinematic vorticity
2D v. 3D Main Point: Synthesis of advanced concepts
in progressive finite strain Relevant Concepts:
– Finite strain– Infinitesimal strain– Flow apophyses– Kinematic vorticity
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3D Strain3D Strain
2D v. 3D Main Point: 3D progressive finite strain Relevant Concepts:
– Non-plane strain– Constriction / Flattening
2D v. 3D Main Point: 3D progressive finite strain Relevant Concepts:
– Non-plane strain– Constriction / Flattening
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3D Strain3D Strain
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Rotating ClastsRotating Clasts
2D v. 3D Main Point: Rotation of elliptical clasts under
progressive finite strain Relevant Concepts:
– Jeffery v. March model rotation– Ellipticity
2D v. 3D Main Point: Rotation of elliptical clasts under
progressive finite strain Relevant Concepts:
– Jeffery v. March model rotation– Ellipticity
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Rotating ClastsRotating Clasts
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Flow LinesFlow Lines
2D v. 3D Main Point: Translation of material points
under progressive finite strain Relevant Concepts:
– Particle flow paths– Flow apophyses
2D v. 3D Main Point: Translation of material points
under progressive finite strain Relevant Concepts:
– Particle flow paths– Flow apophyses
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Shear FabricShear Fabric
2D v. 3D Main Point: Generation of rock fabric under
progressive finite strain Relevant Concepts:
– Translation– Rotation (Jeffery model)
2D v. 3D Main Point: Generation of rock fabric under
progressive finite strain Relevant Concepts:
– Translation– Rotation (Jeffery model)
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Shear FabricShear Fabric
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Teaching TechniquesTeaching Techniques
Combined with physical models, these programs create a bridge between tactile and mathematical learning
These programs can also act as a self-check for labs or homework assignments
Background information is available within each program, with references
Combined with physical models, these programs create a bridge between tactile and mathematical learning
These programs can also act as a self-check for labs or homework assignments
Background information is available within each program, with references
http://www.geology.wisc.edu/~skylarp/java.html
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ConclusionsConclusions
Based on our experiences with one semester of introductory-level students, these simple computer programs are an effective tool for enhancing students' comprehension of basic displacement concepts
Based on our experiences with one semester of introductory-level students, these simple computer programs are an effective tool for enhancing students' comprehension of basic displacement concepts
http://www.geology.wisc.edu/~skylarp/java.html
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AcknowledgmentsAcknowledgments
UW - Madison Structure Group NSF Graduate Research Fellowship
Program
UW - Madison Structure Group NSF Graduate Research Fellowship
Program
http://www.geology.wisc.edu/~skylarp/java.html