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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

336
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
336
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

654
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
654
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

404
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
404
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

789
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
789
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

1.0K
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
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Pilot study on deformed bullet correlation.

Zhe Chen1, John Song2, Johannes A Soons2

  • 1School of Mechatronics Engineering, Harbin Institute of Technology (HIT), Harbin, 150001, China; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.

Forensic Science International
|December 17, 2019
PubMed
Summary
This summary is machine-generated.

A new image reconstruction technique improves algorithmic bullet identification for deformed or fragmented bullets. This method enhances the Congruent Matching Profile Segments (CMPS) analysis of land engraved area (LEA) striations, aiding forensic toolmark comparison.

Keywords:
CMPSCongruent matchingDeformed bulletsForensic scienceImage reconstructionTool mark identification

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Area of Science:

  • Forensic Science
  • Ballistics
  • Image Processing

Background:

  • Standard bullet identification relies on pristine striations, which are often degraded in crime scene evidence.
  • Deformed or fragmented bullets present significant challenges for traditional toolmark comparison methods.
  • Existing algorithms struggle with distorted or incomplete land engraved area (LEA) striations.

Purpose of the Study:

  • To develop and validate an image reconstruction procedure for improving algorithmic correlation of deformed bullets.
  • To assess the effectiveness of the Congruent Matching Profile Segments (CMPS) method with reconstructed data.
  • To enhance the accuracy of bullet identification in forensic casework involving damaged projectiles.

Main Methods:

  • An image reconstruction procedure was developed to correct pattern distortion in LEA topography images.
  • The Congruent Matching Profile Segments (CMPS) method was applied to correlate LEA striation profiles.
  • Validation involved 57 deformed/fragmented 9mm Luger bullets from 7 ammunition brands, comparing reconstructed vs. original data.

Main Results:

  • The image reconstruction significantly improved correlation results for distorted bullet LEAs.
  • Improvements were most pronounced for bullets with substantial deformation and visible striations.
  • The CMPS method showed enhanced performance after LEA profile reconstruction.

Conclusions:

  • The proposed image reconstruction procedure is effective in overcoming challenges posed by deformed bullets in forensic analysis.
  • Algorithmic bullet identification can be significantly improved through image correction techniques.
  • This method offers a valuable tool for forensic examiners dealing with degraded ballistic evidence.