14 - Glass fracture patterns Activity 14-1 Apr. Fill in the blanks and answer the following questions using pages 396 411 from the textbook.
Glass Fracture Activity Pdf Glass Fracture Patterns Procedure 1 Examine The Diagrams Below That Show A Side View Of A Window Both Before And After Course Hero
Three different impacts resulted in the breaking of the glass.
. There are 34 words total. Obsidian is a natural glass often formed in volcanoes. Form on the same side of the glass as the point of impact.
Analyze glass fracture patterns and determine the order of the breaks in. Typically occurs so fast during a glass fracture event that it appears to be instantaneous to the observers. Glass is not highly resistant to fracture.
Click again to see term. Strength is central to the fracture surface features for it determines the strain energy. Fundamentals Investigations Chapter 14 Activity Handout Name ___________________ ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure.
Tare beaker with water. Mass of water displaced Volume of water displaced Volume of piece of glass. Up to 10 cash back The topographical features which appear on the fracture surfaces of broken glass objects and the resulting crack patterns which develop are Natures documentation of the fracture event.
Examine the diagram of the glass fracture patterns below. Examine edge for Wallner lines 4. The main objective of this activity is for students to get student to analyze and interpret glass analysis data and fracture pattern in order to determine what happen at a crime scene.
Glass fracture patterns worksheet answers. 15 - Glass quiz Shoe prints Ch. Tie thread around glass.
TYPES OF CRACKS 1 Radial cracks. The notes will be submit to the instructor by the end of. Circle around point of impact.
1 The History of Glass. By the end of this activity you will be able to. 2nd Concentric Fractures Concentric circles that have the same center.
13 - The refractive index Activity 14-4 modified Lab - Using Snells Law and solvents to determine the refractive index of known and unknown samples of glass Apr. Tap again to see term. Types of Glass OBJ Because glass is a stable material that does not deteriorate over time it has a variety of uses.
Its fracture toughness K IC value is only 1 MPa m. A When certain types of rock are exposed to extremely high temperatures such as lightning strikes or erupting volcanoes glass can form. The glass is called an amorphous solid because its atoms are arranged randomly Figure 14-1.
Draw an arrow indicating the direction in which the force was applied to the window. Soda-lime glass Flat Glass Borosilicate Glass Leaded Glass Tempered Glass Laminated Glass Bulletproof Glass Fracture Patterns Primary Pattern Secondary Patterns The secondary patterns are concentric patterns. Although the examination of a single crack may indicated a degree of similarity the overall composition and shape of cracks in these two types of glass differ significantly.
Force originated from opposite side of right angle. 45866_14_c14_p394-429indd 416 12107 65416 AM ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. Determine the point of impact and direction of force.
Stack the series of activity pictures on the right with dashed lines to where the activity takes place ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. Find Volume of glass. ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure.
Find right angle at extreme edge of radial fracture 5. 15 cast shoeprints lab. Remove piece of glass closest to impact site 2.
The cracks will appear radiating outwards from the point of impact making a star shaped fracture known as radial fracture. Mass the piece of glass. Crack in glass that sticks out.
When an object has been thrown through a glass pane a fracture forming a pattern somewhat like a spider-web will be seen. Plain glass will yield true radial and concentric fractures which are similar to the sketch above. It has a smooth glassy texture and will commonly fracture with a curved fracture plane called conchoidal fracture after the resemblance to.
Examine the diagrams below that show a side view of a window both before and after impact. 1st Radial Fractures Start at the point of impact and radiate move outward from there. As the expert in glass you told the.
The processes of glass fracture are given the nature and formation of glass as a brittle isotropic solid is discussed and the mechanical strength of glass is considered in terms of its atomic bond strengths and external flaws. Calculate density of the glass. Determine the point of impact and direction of force.
Fracture patterns are unique. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass.
Fracture features in a piece of glass reflect the nature of the glass and the direction of travel and velocity of the breaking object. SUSPEND the glass in water. Day-1-Students will first watch the video lecture or power-point glass analysis and take summary notes.
Explain your answer using the terms tension and compression. Form on the side opposite the point of impact. Of A Small Piece of Glass 1.
Everything Science and Beyond. The Analysis of Glass Word Search for a Forensics Course. Draw an arrow indicating the direction in which the.
Examine the diagrams below that show a side view of a window both before and after impact. Glass is brittle This article is an invited paper selected from presentations at MST 2009 held October 2529 2009 in Pittsburgh. Click card to see definition.
Window Glass 253-254 gml Pyrex Glass 229-239 gml. Locate edge corresponding to radial fracture break site 3. Analyze glass fracture patterns and determine the order of the breaks in the glass.
They are considered after a brief discussion of glass strength. Why Radial Concentric Fractures Form. If you examined the actual glass could you determine who was telling the truth.
By the end of this activity you will be able to. The radial fracture originates on the surface opposite to that on which force. Explain two different methods to determine the direction of the bullets based on glass analysis.
Tap card to see definition. Major modern theories of glass fracture propagation are reviewed and the relationships of stress conditions to. Due to its irregular atomic structure when the glass is broken it produces a variety of fracture patterns.
Word Search covering the vocabulary that will be used when discussing Properties of Matter and the Analysis of Glass with students in a Forensics Course. B What was obsidian used for. Glass fracture examinations can provide information as to the direction of the breaking force and the.
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