unstable

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Related to unstable fracture: transverse fracture

unstable

1. (of a chemical compound) readily decomposing
2. Physics
a. (of an elementary particle) having a very short lifetime
b. spontaneously decomposing by nuclear decay; radioactive
3. Electronics (of an electrical circuit, mechanical body, etc.) having a tendency to self-oscillation

unstable

[¦ən′stā·bəl]
(physics)
Capable of undergoing spontaneous change, as in a radioactive nuclide or an excited nuclear system.
References in periodicals archive ?
Mohsen Mardani et al [24] reported Harris Hip Score 24 patients treated with DHS with stable fracture was 87.08 and for unstable fracture (36 patients) score was 84.61, while score for patients treated with PFLCP having stable fractures was 85.43 and with unstable fracture was 81.20.
Caption: Figure 15: Elastic module and unstable fracture toughness at different corrosion time.
reported that re-operation was necessary in 2 patients of a series of 14 unstable fractures treated with the reverse LISS method.
The actual length of the crack is longer than the depth of the precutting crack of the specimen because there is a stage of steady expanding before unstable fracture occurs, and the propagation length of the crack is the difference of the actual length of the crack and the depth of the precutting crack of the specimen.
At this time, the stage of slip happens and then unstable fracture process begins.
A total of 97 adult patients completed the study, including 52 with stable fractures and 45 with unstable fractures, Dr.
For these polymers, the initiation of unstable fracture can be accurately described by either [K.sub.IC] or [G.sub.IC].
For instance, unstable fracture configurations may not be amenable to single-bone fixation, which may not have been included in retrospective reviews.
The fracture process of concrete structures underwent three main stages: (i) crack initiation, (ii) stable crack propagation, and (iii) unstable fracture. Accordingly, the double-K fracture criterion initially introduced by Xu and Reinhardt [1] showed the crack initiation, crack propagation, and failure during a fracture process until the maximum load is reached.
[3-5] reported that external loading of WC-Co plate with CVD-diamond resulted in the unstable fracture of the substrate.
For those blends whose ligaments are not fully yielded, that is, blends with 25 phr elastomer at 20[degrees]C and 20 phr elastomer at 40[degrees]C, their fracture behavior is ductile tearing with plastic flow confined to a small circular region ahead of the notch tip, followed by fast unstable fracture with a finite yield strip on either surface.
They recommended use of the intra medullary device in unstable fracture over the current standard treatment of dynamic hip screw and plate.