How can i make a explosion that unjoint parts?

i want make a explosion that unjoint 2 parts, i made 2 parts of same size and i put both with universal surface, i want an explosion that remove the universal surface of both or separate the parts, i tried but i cant

(i dont know edit the explosion)

Some help with explosions from the Dev...

Fires when the Explosion hits a BasePart within its Explosion.BlastRadius. Returns the part hit along with the distance of the part from Explosion.Position. Note that the effect of an Explosion is not disrupted by obstacles, this means parts shielded behind other parts will still be hit, even if the BasePart they are shielded behind is anchored. This event will also fire when Explosion.BlastPressure is equal to zero. This means developers can program their own custom behavior for explosions by eliminating the explosion’s influence on BaseParts and Terrain. Note that this event will fire for every BasePart hit. This means it can fire multiple times for the same player character (as the character Model is made up of multiple parts). For this reason when dealing custom damage using the Explosion.Hit event it’s recommended to implement a check to see if the character has already been hit by the Explosion.

local function customExplosion(position, radius, maxDamage)
	local explosion = Instance.new("Explosion")
	explosion.BlastPressure = 0 -- this could be set higher to still apply velocity to parts
	explosion.DestroyJointRadiusPercent = 0 -- joints are safe
	explosion.BlastRadius = radius
	explosion.Position = position
		
-- set up a table to track the models hit
	local modelsHit = {}
 
	-- listen for contact
	explosion.Hit:Connect(function(part, distance)
		local parentModel = part.Parent
		if parentModel then 
			-- check to see if this model has already been hit 
			if modelsHit[parentModel] then
				return
			end
			-- log this model as hit
			modelsHit[parentModel] = true
 
			-- look for a humanoid
			local humanoid = parentModel:FindFirstChild("Humanoid")
			if humanoid then
				local distanceFactor = distance / explosion.BlastRadius -- get the distance as a value between 0 and 1
				distanceFactor = 1 - distanceFactor -- flip the amount, so that lower == closer == more damage
				humanoid:TakeDamage(maxDamage * distanceFactor) -- TakeDamage to respect ForceFields
			end	
		end
	end)
 
	explosion.Parent = game.Workspace
end