TYPES OF CRACKS 1 Radial cracks. The glass was fractured due to a rock impact.
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
The glass is called an amorphous solid because its atoms are arranged randomly Figure 14-1.
. Mass the piece of glass. SUSPEND the glass in water. Now what interests me is the apparent periodicity and structure of the fracture pattern.
Fracture patterns can provide clues about the direction and rate of impact. 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. Examine edge for Wallner lines 4.
Explain your answer using the terms tension and compression. When stretched too far fracture lines appear and the glass may break. It found in many shapes size colour and types.
This is a great initial activity after introducing the students to their vocabulary words in the unit. Calculate density of the glass. Determine the point of impact and direction of force.
Examine the diagram of the glass fracture patterns below. 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. Learn vocabulary terms and more with flashcards games and other study tools.
Draw an arrow indicating the direction in which the force was applied to the window. At the scene of occurrence the glass may be fractured either as an intentional act or due to accident. Explain two different methods to determine the direction of the bullets based on glass analysis.
Tare beaker with water. For the forensic community the ability to piece together glass fragments in order to show a physical fit or a Physical Match is the strongest evidentiary finding of an association. Window Glass 253-254 gml Pyrex Glass 229-239 gml.
15 - Glass quiz Shoe prints Ch. The radial fracture originates on the surface opposite to that on which force. Glass fracture examinations can provide information as to the direction of the breaking force and the.
Examine the diagrams below that show a side view of a window both before and after impact. When an object has been thrown through a glass pane a fracture forming a pattern somewhat like a spider-web will be seen. Glass fracture patterns worksheet answers.
Types of Glass OBJ Because glass is a stable material that does not deteriorate over time it has a variety of uses. May 14 2017 Glass fracture patterns worksheet answers. Within the set are the words conchoidal fractures concentric fractures radial fractures and 6 types of glass.
Tie thread around glass. 9 Vocabulary is a fantastic review activity that requires students to match 9 words 9 definitions and 9 pictures. 15 cast shoeprints lab.
Are periodic fractures something commonly encountered in tempered glass. Analyze glass fracture patterns and determine the order of the breaks in the glass. GLASS FRACTURE ANALYSIS tl The advancement of knowledge about glass fracture patterns in criminalistics car be characterized as at best sporadic and in some instances superficial.
It has a smooth glassy texture and will commonly fracture with a curved fracture plane called conchoidal fracture after the resemblance to. Fracture features in a piece of glass reflect the nature of the glass and the direction of travel and velocity of the breaking object. A great deal is to be learned about fracture characteristics from published research of those outlying fields concerned with brittle fracture problems.
Use glass fracture patterns to explain how to sequence events that occurred to form the broken glass. 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. Obsidian is a natural glass often formed in volcanoes.
Due to its irregular atomic structure when the glass is broken it produces a variety of fracture patterns. Of A Small Piece of Glass 1. Involving fracture pattern analysis of window pane glass and glass bottles.
Determine the point of impact and direction of force. Glass fragments may be an evidence of great value encountered in the investigation of various types of offences. The purpose of this chapter is to provide a geological and geomechanical understanding of fracture formation characteristics of various fracture types network patterns and internal structureThe geometry of fractures their internal architecture and present-day state of stress control fluid flow in fractured rocks.
Fundamentals Investigations Chapter 14 Activity Handout Name ___________________ ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure. Find right angle at extreme edge of radial fracture 5. Three different impacts resulted in the breaking of the glass.
As the expert in glass you told the. By the end of this activity you will be able to. 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.
14 Forensics Glass Evidence. Glass is the hard amorphous solid. Find Volume of glass.
Draw an arrow indicating the direction in which the. Force originated from opposite side of right angle. 14 - Glass fracture patterns Activity 14-1 Apr.
45866_14_c14_p394-429indd 416 12107 65416 AM ACTIVITY 14-1 GLASS FRACTURE PATTERNS Objectives. Plain glass will yield true radial and concentric fractures which are similar to the sketch above. Examine the diagrams below that show a side view of a window both before and after impact.
Glass fractures 1. Applied to glass it refers to having particles that are arranged randomly instead of in a definite pattern. Locate edge corresponding to radial fracture break site 3.
Mass of water displaced Volume of water displaced Volume of piece of glass. If you examined the actual glass could you determine who was telling the truth. Glass fractures are of paramount importance in shooting cases where firearm is used as it can provide significant.
ACTIVITY 14-1 GLASS FRACTURE PATTERNS Procedure. 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. Plain glass will yield true radial and concentric fractures which are similar to the sketch above.
SUBJECT NAME INTRODUCTION TO FORENSIC SCIENCE IFS STUDENT NAME MUDASSAR PINJARI 2. As far as i know there are no heating elements on the window section in the picture. Remove piece of glass closest to impact site 2.
Fracture Patterns in Broken Glass Glass has some flexibility. The cracks will appear radiating outwards from the point of impact making a star shaped fracture known as radial fracture. Is the mechanism that generates such fractures.
Wavy fracture lines also glass tends to break near areas of high. A geomechanical understanding of these properties. Fracture patterns are unique.
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
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
Activity 14 1 Glass Fracture Patterns Answer Key Fill Online Printable Fillable Blank Pdffiller
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14 1 Doc Glass Fracture Patterns 1 Examine The Diagrams Below That Show A Side View Of A Window Both Before And After Impact Determine The Point Of Course Hero
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