Issue 14

D.

Firrao et alii, Fr

attura ed Integri

tà Strutturale, 1

4 (2010) 81-92

; DOI: 10.3221/I

GF-ESIS.14.09

gra in t bod

in boundarie he objects re y liquids dur e metallograp ngside the alu e screws and s on the uppe the centre of

s, gas washin trieved fairly ing the more hic investiga minium allo the ring coul r left corner the dashboar

g on surface intact or on than thirty y tion then fo y fragments r d be position of the dashb d.

or rolled edg surfaces of ears elapsed cused on the etrieved from ed fairly well oard (Fig. 9),

es developin the fragment since the cor gold ring an the bodies. on the aircra the left Matt

g at external s retrieved in pse burials. d the stainle ft scene at th ei hand with

surface of fra the bodies, ss steel screw e moment o the ring was

cture zones which had b s of the trip f the acciden probably sta

were not pre een corroded le indicator c t: the instrum ying just in fr

sent by ase,

Th alo Th wa of

ent ont

Figure 9 : Th

e triple indica

tor was positio

ned on the up

per left corner

of the airplan

e dashboard.

R E

VIEW OF PR

EVIOUS WO

RK

Mi T

crostructural ef he revie focused Inside a face, is reflec critical shear rge is high, t the case of s ects placed q reover, if th ourably orien appear in iso rostructural ds. Dependi cific alloy di ice modificat omogeneous e [2], micros perature ef dency to loca ce equally lo rease. The co compression rious recrysta es as well as

fects of an exp w has been l . metal compo ted as a tens stress for sl he maximum mall charges uite close to e distance is ted crystals lated favour signs detecta ng on the ch ctate which ions. distribution copic examin fects may als lised plastic calised micro rresponding wave are fa llization stag on the actu

losion on FC imited to FC nent the pri ion wave. Bo ip or mechan stress is reac the overpres the charge. fairly high i and can prop able oriented ble by micro arge mass a of the above s of twins in ations have o affect the deformation structural va material bein cilitated owin es can be en al material re

C metals C metals, giv mary overpre th the comp ical twinning hed; then the sure does no As the targe n respect to agate to the grains at or scopy inside nd the targe two morph side the com to be as thor microstructu in thin bands riations. Asi g less stable, g to the redu visioned dep crystallization

en the type ssure wave y ression wave . In the case material bre t cause break t-to-charge d the scale of nearest ones close to the c the crystals t-to-charge d ologies preva ponent havi ough as poss re. It is kno (shear band de from this recrystallizat ced recrystall ending on th temperature

of alloys on w ields a comp and the ref of objects qu aks up, usual age, but can istance incre the phenom . In the extr ompression w can be eithe istance, crys ils. X-ray di ng be detecte ible. wn that in h s) is present, , all crystal d ion phenom ization temp e intensity o : (i) no recry

hich the fo ression wave lected wave m ite close to t ly by delamin cause comp ases, only la enon, lattice eme case, on ave impinge r mechanical tal habit and ffraction ana d in respect igh strength with a very lo eformations ena under th erature. f both overp stallization; (

rensic investi , which, upo ay cause th he explosive ation [1]. ressive plasti ttice deforma deformation ly a few plas d surface. twins or he stacking fau lysis may be of the incid steels or Al calised temp induce a loca e temperatur ressure and ii) limited re

gation had to n reaching a e overcomin charge, or if c deformatio tion may oc is restricted tic deformati avy multiple lt energy of useful to de ent overpres alloys a pecu erature raise l internal en e wave follow overtempera crystallization

be free g of the n in cur. to ons slip the tect sure liar and ergy ing ture (at

sur the cha In obj Mo fav can Mic ban spe latt Inh wav Tem ten hen inc the Va wav

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