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Forensic evidence in apparel fabric due to stab events

โดยศร�ญญา ส้งเคราะห�รห�ส้ 51312325

S.E Kemp , D.J. Carr , J. Kieser , B.E. Niven , M.C. Taylor

Introduction

Fabric construction

purpose

1. Mechanism of human impact

2. Impact rig

Material and

methods

Components of the instrumented

Drill fabric Knit fabric

Test methods.

AnalysisAnalysis - Visible

- Light microscope

- Scanning Electron Microscope (SEM)

Result

Fig. 3. Typical mechanisms of penetration; (a) penetration, (b) runthrough, (c)guard impact, (d) bounce.

Fig. 4. Kitchen blade ((i) drill fabric, (ii) knit fabric; (a) macroscopic image, (b and c) light microscopy (x12), upper and lower edge, (d and e) fibre ends from upper edge, (f andg) fibre ends from lower edge).

Fig. 5. Hunting blade ((i) drill fabric, (ii) knit fabric; (a) macroscopic image, (b and c) light microscopy (x12), upper and lower edge, (d and e) fibre ends from upper edge,(f and g) fibre ends from lower edge).

Fig. 6. Screwdriver blade ((i) drill fabric, (ii) knit fabric; (a) macroscopic

image, (b) light microscopy (x12), upper and lower edge, (c and d) fibre ends).

Fig. 7. Planar array in new and degraded specimens (drill fabric).

Fig. 9. Typical example of fibre damage due to laundering (drill

fabric).

Fig. 10. Comparison of a typical new and degraded fibre end (kitchen blade, scalloped edge; drill fabric).

Fig. 11. Typical example of flattened fibres observed in impacted fabrics

laundered60 times (drill fabric).

Discussion

Blade typeFabric

constructionDegrada

tion

Special Thanks Special Thanks Aj. sant

sukhavachana ;Adviser

Thanks my teachers and everyone for your attention!

Question?