Since nothing can exit a black hole (except for Hawking radiation), we have no way of knowing what physical processes might occur inside the event horizon. Tidal forces are gravitational in nature and are not affected by fusion reactions (except to the insignificant extent that fusion results in mass loss, decreasing the gravitational force). The gravitational force experienced by an object will be greater on those parts of the object closest to the attractor than on those parts farthest away. The result of this difference is a net force (the tidal force) which acts to pull on the object both towards and away from the attractor. In other words, it is the gravitational field gradient, not its strength, that determines the magnitude of the tidal force.
Source(s):
http://www.haydenplanetarium.org/tyson/read/essays/nathist/tidalforce

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