Glass fracture examinations can provide information as to the direction of the breaking force and the. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass.
Copy Of Glass Fracture Patterns Worksheet Glass Fracture Patterns Worksheet 1 Examine The Diagrams Below That Show A Side View Of A Window Both Course Hero
Glass Fracture Patterns Worksheet 1.
. Analyze glass fracture patterns and determine the order of the breaks in the glass. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. Glass is not highly resistant to fracture.
Examine edge for Wallner lines 4. The cracks will appear radiating outwards from the point of impact making a star shaped fracture known as radial fracture. Form on the side opposite the point of impact.
Of A Small Piece of Glass 1. Day-1-Students will first watch the video lecture or power-point glass analysis and take summary notes. Find Volume of glass.
45866_14_c14_p394-429indd 416 12107 65416 AM ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. Circle around point of impact. 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.
ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure. 14 - Glass fracture patterns Activity 14-1 Apr. Everything Science and Beyond.
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. 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. SUSPEND the glass in water.
15 - Glass quiz Shoe prints Ch. Tap again to see term. Tap card to see definition.
When an object has been thrown through a glass pane a fracture forming a pattern somewhat like a spider-web will be seen. Glass is brittle This article is an invited paper selected from presentations at MST 2009 held October 2529 2009 in Pittsburgh. Mass of water displaced Volume of water displaced Volume of piece of glass.
The Analysis of Glass Word Search for a Forensics Course. Glass fractures 1. 416 Glass Evidence ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives.
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. Why Radial Concentric Fractures Form. Its fracture toughness K IC value is only 1 MPa m.
Tie thread around glass. Analyze glass fracture patterns and determine the order of the breaks in the glass. Strength is central to the fracture surface features for it determines the strain energy.
They are considered after a brief discussion of glass strength. Examine the diagrams below that show a side view of a window both before and after impact. Crack in glass that sticks out.
Major modern theories of glass fracture propagation are reviewed and the relationships of stress conditions to. Types of Glass OBJ Because glass is a stable material that does not deteriorate over time it has a variety of uses. Draw an arrow indicating the direction in which the force was applied to the window.
Mass the piece of glass. Fracture patterns are unique. Determine the point of impact and direction of force.
By the end of this activity you will be able to. The glass is called an amorphous solid because its atoms are arranged randomly Figure 14-1. Explain two different methods to determine the direction of the bullets based on glass analysis.
Window Glass 253-254 gml Pyrex Glass 229-239 gml. Locate edge corresponding to radial fracture break site 3. Obsidian is a natural glass often formed in volcanoes.
1 The History of Glass. Glass fracture patterns worksheet answers. There are 34 words total.
Analyze glass fracture patterns and determine the order of the breaks in. A When certain types of rock are exposed to extremely high temperatures such as lightning strikes or erupting volcanoes glass can form. Examine the diagram of the glass fracture patterns below.
Form on the same side of the glass as the point of impact. 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. 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.
Three different impacts resulted in the breaking of the glass. 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. 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.
Click card to see definition. Plain glass will yield true radial and concentric fractures which are similar to the sketch above. B What was obsidian used for.
The notes will be submit to the instructor by the end of. Remove piece of glass closest to impact site 2. Tare beaker with water.
Find right angle at extreme edge of radial fracture 5. Fracture features in a piece of glass reflect the nature of the glass and the direction of travel and velocity of the breaking object. Click again to see term.
The radial fracture originates on the surface opposite to that on which force. 1st Radial Fractures Start at the point of impact and radiate move outward from there. Examine the diagrams below that show a side view of a window both before and after impact.
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. Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. If you examined the actual glass could you determine who was telling the truth.
As the expert in glass you told the. By the end of this activity you will be able to. It found in many shapes size colour and types.
Calculate density of the glass. Force originated from opposite side of right angle. Fill in the blanks and answer the following questions using pages 396 411 from the textbook.
15 cast shoeprints lab. By the end of this activity you will be able to. Tempered glass is also known as safety glass.
2nd Concentric Fractures Concentric circles that have the same center. Explain your answer using the terms tension and compression. Glass is reasonably hard transparent or translucent material composed of fused inorganic materials primarily of silicon dioxide sand Glass is super cooled liquid amorphous in nature.
SUBJECT NAME INTRODUCTION TO FORENSIC SCIENCE IFS STUDENT NAME MUDASSAR PINJARI 2. Due to its irregular atomic structure when the glass is broken it produces a variety of fracture patterns. Determine the point of impact and direction of force.
Typically occurs so fast during a glass fracture event that it appears to be instantaneous to the observers. It has a smooth glassy texture and will commonly fracture with a curved fracture plane called conchoidal fracture after the resemblance to. TYPES OF CRACKS 1 Radial cracks.
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