SUSPEND the glass in water. Analyze glass fracture patterns and determine the order of the breaks in.
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Strength is central to the fracture surface features for it determines the strain energy.
. This type of determination compares a known sample to a glass fragment to see if the two samples came from the same source. 2nd Concentric Fractures Concentric circles that have the same center. B What was obsidian used for.
Determine the point of impact and direction of force. As the expert in glass you told the. By the end of this activity you will be able to.
Why Radial Concentric Fractures Form. Applied to glass it refers to having particles that are arranged randomly instead of in a definite pattern. Obsidian is a natural glass often formed in volcanoes.
Is the mechanism that generates such fractures. Fracture features in a piece of glass reflect the nature of the glass and the direction of travel and velocity of the breaking object. 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.
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. Click card to see definition. Are periodic fractures something commonly encountered in tempered glass.
By the end of this activity you will be able to. As far as i know there are no heating elements on the window section in the picture. 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.
Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. The radial fracture originates on the surface opposite to that on. If you examined the actual glass could you determine who was telling the truth.
Find Volume of glass. Fracture patterns are unique. Analyze glass fracture patterns and determine the order of the breaks in the glass.
Glass Fracture Patterns Worksheet 1. 15 - Glass quiz Shoe prints Ch. Types of Glass OBJ Because glass is a stable material that does not deteriorate over time it has a variety of uses.
Explain two different methods to determine the direction of the bullets based on glass analysis. Click again to see term. Three different impacts resulted in the breaking of the glass.
What is this property called. 15 cast shoeprints lab. Tap again to see term.
ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure. Examine the diagram of the glass fracture patterns below. Form on the side opposite the point of impact.
1 The History of Glass. Label the point of impact and draw an arrow indicating the direction in which the force was applied to the window--- Before Impact After Impact 2. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass.
14 Forensics Glass Evidence. Draw an arrow indicating the direction in which the force was applied to the window. Plain glass will yield true radial and concentric fractures which are similar to the sketch above.
Glass is not highly resistant to fracture. By the end of this activity you will be able to. Form on the same side of the glass as the point of impact.
- Which direction did the break travel. Glass analysis includes determining the type of glass based on glass fragments. The cracks will appear radiating outwards from the point of impact making a star shaped fracture known as radial fracture.
Of A Small Piece of Glass 1. - Which bullet hole came first. Tourmaline and window glass fracture with the same pattern which is called _____.
The glass is called an amorphous solid because its atoms are arranged randomly Figure 14-1. Now what interests me is the apparent periodicity and structure of the fracture pattern. - which side did the force occur.
When an object has been thrown through a glass pane a fracture forming a pattern somewhat like a spider-web will be seen. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. A When certain types of rock are exposed to extremely high temperatures such as lightning strikes or erupting volcanoes glass can form.
However the entire fractured pane or window can be helpful when determining direction and sequence of force. Examine the diagrams below that show a side view of a window both before and after impact. They are considered after a brief discussion of glass strength.
The glass was fractured due to a rock impact. The notes will be submit to the instructor by the end of. 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.
Wavy fracture lines also glass tends to break near areas of high. Tie thread around glass. 1st Radial Fractures Start at the point of impact and radiate move outward from there.
Due to its irregular atomic structure when the glass is broken it produces a variety of fracture patterns. Beryl Specific gravity is a measurement of how heavy an object is relative to the weight of water. Mass the piece of glass.
Tap card to see definition. Glass fracture patterns worksheet answers. 14 - Glass fracture patterns Activity 14-1 Apr.
Learn vocabulary terms and more with flashcards games and other study tools. Mass of water displaced Volume of water displaced Volume of piece of glass. TYPES OF CRACKS 1 Radial cracks.
Glass fracture examinations can provide information as to the direction of the breaking force and the. Determine the point of impact and direction of force. Sphalerite Sphalerite has an interesting property whereby it flashes orange when scratched or struck.
Typically occurs so fast during a glass fracture event that it appears to be instantaneous to the observers. 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. Calculate density of the glass.
416 Glass Evidence ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. Analyze glass fracture patterns and determine the order of the breaks in the glass. It has a smooth glassy texture and will commonly fracture with a curved fracture plane called conchoidal fracture after the resemblance to.
Explain your answer using the terms tension and compression. Day-1-Students will first watch the video lecture or power-point glass analysis and take summary notes. 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.
Fill in the blanks and answer the following questions using pages 396 411 from the textbook. 45866_14_c14_p394-429indd 416 12107 65416 AM ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. - What direction did the bullet come from.
Tare beaker with water. Glass is brittle This article is an invited paper selected from presentations at MST 2009 held October 2529 2009 in Pittsburgh. Examine the diagrams below that show a side view of a window both before and after impact.
Window Glass 253-254 gml Pyrex Glass 229-239 gml. Its fracture toughness K IC value is only 1 MPa m. Glass fracture patterns may answer the following questions.
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